Undertone Is the Foundation
The single most important attribute of a clothing color is its undertone — whether it leans warm (yellow, orange, red) or cool (blue, green, violet). Warm and cool undertones fight each other: a warm camel coat with a cool gray suit creates an underlying tension that the eye registers as 'something's off' even without being able to articulate it. Building a wardrobe around consistent undertone — all warm or all cool — is the primary rule that makes clothes combine easily.
