Dark neutrals and deep jewel tones are the most commonly worn colours for formal occasions, often used as a base with a single deeper accent.
Filtered for neutral colours with a medium-to-very-deep tone depth, plus deep/very-deep jewel tones.
Category: neutralBlack
neutral · very deep
Grey
neutral · medium
Burgundy
red · deep
Maroon
red · deep
Brick Red
red · deep
Green
green · deep
Forest Green
green · deep
Olive Green
green · deep
Jade
green · deep
Navy Blue
blue · deep
Teal
cyan · deep
Cobalt Blue
blue · deep
Cerulean
cyan · deep
Indigo
blue · deep
International Klein Blue
blue · deep
Purple
purple · deep
Tyrian Purple
purple · deep
Chocolate Brown
orange · deep
Chestnut
red · deep
Sea Green
green · deep
Sapphire
blue · deep
Taupe Grey
neutral · medium
Graphite
neutral · deep
Midnight Blue
blue · deep
Formality in colour is signalled by depth and restraint: dark, low-chroma colours such as navy, charcoal and black, a limited number of hues, and strong lightness contrast between shirt and suit. These are conventions rather than rules of perception, and they come from where formal dress developed — northern European daylight and interiors — which is also why they photograph cleanly. A single restrained accent, in a tie or pocket square, keeps the whole within the convention.