The useful thing about an occasion is not its name but what it constrains: how dressed everyone will be, what the light is doing, whether the room is fixed, and whether the whole thing ends up in photographs that outlive it. Those decide far more than any rule about which colours suit which events.
Most clothing rules are conventions, not facts, and most of them are local. Colourwise records a convention where one genuinely exists, says where it applies, and does not extend it past that. Where a host, a family or a couple has stated what they want, that is the answer and no general convention overrides it.
Twelve of the 24 occasions modelled here have their own page, because each answers something the coordinator does not. The rest are answered by the tool.
What guests conventionally avoid and where that convention applies, how to sit clearly outside the couple's palette, and how season, venue and climate change the answer.
Carries a real convention
Why several garments in 'the same' colour rarely match, when to match exactly and when to spread across a range, and how a line of five photographs differently from one person in a mirror.
No general convention
Why midnight blue reads blacker than black under artificial light, where the colour decision actually lives in a codified dress code, and which alternatives events genuinely accept.
Carries a real convention
The vaguest dress code in common use, what it actually asks for, and why fabric sheen separates a cocktail outfit from a work outfit more reliably than colour does.
Carries a real convention
Why no colour makes anyone read as trustworthy, what industry convention and contrast actually do, and how to choose for a room you have not seen.
No general convention
Matching the median of the room rather than an abstract idea of professionalism, plus what a webcam's auto-exposure does to pure white and pure black next to your face.
No general convention
Low warm light is the governing constraint, and it is why a cool pastel that looked fresh in daylight reads grey and slightly muddy at dinner.
No general convention
Full daylight is the most saturating light most people ever dress in, several courses publish enforced dress codes, and both change what a confident colour looks like.
Carries a real convention
A gown you did not choose, in a colour the institution picked, over whatever you wore — and only the collar, shoes and hem actually show.
No general convention
Coloured event lighting has an incomplete spectrum, so a fabric can only reflect what is there. Strong clear colours survive it and pale pastels take on whatever the room is throwing.
No general convention
Several people must work as one composition, and the result is looked at for decades. Coordinated is not matching, and matching photographs badly.
No general convention
The family's wishes override every convention, mourning colour varies substantially between cultures and faiths, and Colourwise does not generalise across them.
Carries a real convention
5 of the 24 occasions modelled here carry a convention worth knowing about. The other 19 do not, and treating preference as a rule is how most clothing advice goes wrong.
Several racecourses publish dress codes for particular enclosures, and some specify hat or headwear requirements and minimum coverage.
Where it applies. Specific to individual venues and enclosures rather than to racing generally — check the meeting's own published code, which changes.
Conventionally short or midi rather than full-length, and conventionally dressier fabrics than a work outfit.
Where it applies. Broadly Western and increasingly loosely applied; many hosts use the term to mean 'smart' and nothing more.
Guests conventionally avoid white, ivory and very pale cream, and increasingly avoid full head-to-toe black at daytime weddings. Where the couple has published a palette, guests conventionally avoid matching the wedding party.
Where it applies. Common in the UK, Ireland, North America, Australia and much of Western Europe. It is not universal — in several cultures white is not the wedding colour and the convention does not apply, and in some red is the significant colour instead. Follow the couple's own guidance over any general rule.
Dark, muted, low-chroma clothing is the common convention in much of Europe and North America. Many families now specifically request bright colours instead, and that request takes precedence.
Where it applies. Mourning colour varies substantially between cultures and faiths — white is the mourning colour in parts of East and South Asia, and other traditions have their own. Colourwise does not generalise across them; if you do not know the family's tradition, ask someone who does rather than assume.
Traditionally a dinner jacket in black or midnight blue with matching facings, worn after six in the evening. Midnight blue is the long-standing alternative to black rather than a modern departure — it was adopted precisely because it reads blacker than black under artificial light.
Where it applies. Western formal dress convention. Many events described as black tie now accept a wider range, and some cultures have their own equivalent formal dress that is entirely appropriate.
A wedding is six or seven separate colour decisions made by different people who mostly cannot see each other’s answers. What a guest is deciding is a different problem from what the wedding party is deciding.
One outfit that fits into a palette you did not choose, in a room you have not seen, alongside people you cannot coordinate with.
Where it goes wrong. Landing near the wedding party's colour without matching it. A guest in almost-the-wedding-party colour is confusing in every group photograph, and it is a more common error than wearing anything actually prohibited.
Two outfits that must work together, against the venue, in the photographs, and across a whole day of changing light.
Where it goes wrong. Choosing under one light — a showroom, an afternoon fitting — and never seeing the outfits under the venue's actual light or under a flash.
Several outfits that read as a set in a photograph while being worn by people of different builds and preferences.
Where it goes wrong. Matching approximately. Several garments bought from different suppliers in 'the same' colour produce several near-identical shades, which is the near-miss problem multiplied by the size of the party.
An outfit that reads as part of the day without competing with the couple or the wedding party.
Where it goes wrong. Coordinating with the wedding party without being in it, which makes group photographs ambiguous about who is in what role.
An outfit seen mostly from the front, at a distance, often against a fixed backdrop.
Where it goes wrong. Wearing something close in lightness to the backdrop, which makes the outline disappear from the back of the room and from every wide photograph.
A palette repeated across many small objects seen at close range, under whatever light the venue provides.
Where it goes wrong. Specifying flowers to match a fabric swatch. The fabric is uniform and the flower is not, so the comparison always reads as the flower being slightly wrong.
What the room contributes, which is usually a great deal and usually not negotiable.
Where it goes wrong. Choosing a palette from a mood board and discovering on the day that the carpet, the stone or the woodwork is arguing with it.
For any group of three or more, match exactly or spread deliberately, and never land in between. Several garments bought separately in 'the same' colour will not be the same colour, and a line of near-identical-but-not shades is the single most visible failure in wedding photography.
A wedding palette is decided by four things, and the couple only controls one of them: the venue's own colours, the season's light, the time of day, and the palette itself. Choosing the palette first and discovering the other three on the day is the most common way a carefully planned scheme turns out not to work.
Often dim, frequently with stained glass throwing strongly coloured light across part of the space, and usually mixed with warm artificial sources.
Low light rewards depth and contrast over subtlety. Pale pastels lose their identity here more than anywhere else on this list.
Usually flat, even overhead artificial light, frequently with one large window along a single wall — which makes it the most reliably mixed-lighting room on this list.
The room contributes little and occasionally works against you. A self-contained palette that does not rely on the setting is the right approach.
Large windows giving strong directional daylight, with deep interior spaces that fall away quickly.
The room is already saying a lot. A restrained palette lets it, and a busy one competes with something much larger than itself.
Warm and often quite dim, with a lot of light bouncing off untreated timber, which tints everything amber.
Everything is warmed by the bounce whether you chose warm or not. Cool colours are pulled towards neutral, so a palette designed as cool will not read as cool here.
Daylight diffused through fabric, which is soft and even and takes on the colour of the canvas — usually a cream or ivory cast.
Unusually forgiving. Diffuse light flatters almost everything and there are no hard shadows, which makes this the easiest venue on the list for colour.
Entirely artificial, usually warm, often with chandeliers producing many small point sources and, increasingly, coloured uplighting.
Warm light and warm fixtures make cool pale colours the most vulnerable choice. Depth survives; pallor does not.
Low, warm and deliberately atmospheric, and usually several stops dimmer than it feels — the eye adapts to it and a camera does not.
A deep outfit against a deep interior disappears. Something lighter near the face is what keeps a person visible in the room and in the photographs.
The most intense light in this list. Direct sun from above plus strong reflection from sand and water below, so subjects are lit from both directions.
Enormous illuminance saturates everything, so a colour that looked confident indoors will look considerably louder here. Pale colours risk disappearing into the sand.
Daylight, plus a large amount of green light bounced up from grass and foliage — which is a real and frequently overlooked cast.
The green bounce makes reds and pinks read slightly more saturated by contrast, and can make pale greens look sickly. It is the one venue where a specific hue relationship is unavoidable.
Strong directional daylight, usually with a low golden period that many events are deliberately timed around.
Golden-hour light warms everything substantially. A palette designed as cool will read neutral, and a warm one will read very warm indeed.
Large windows and high ceilings, often with the light falling off dramatically away from the glass, and frequently mixed with unflattering overhead fittings.
A genuinely neutral backdrop, which is rare and useful. Almost any palette works because the room is not contributing a hue of its own.