adjective Informal.
  1. (of an outfit, décor, etc.) having colors or patterns that match or harmonize too closely: You should coordinate the drapes and bedspread without getting too matchy-matchy.

Origin of matchy-matchy

reduplication of match2 + -y1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Contemporary Examples of matchy-matchy