What is "matchy-matchy"

a. (context fashion of clothes, or upholstery English) Excessively color-coordinated.

Matchy-Matchy is an adjective used to describe something or someone that is very or excessively colour coordinated. It is a term that is commonly used in fashion blogs to describe an outfit that is too coordinated and consists of too many of the same types of colors, patterns, fabrics, accessories, etc. "Matchy-matchy" was added to the Oxford English Dictionary in 2010 along with 200 new words that were previously considered as slang.