matchy-matchy
adj.— «Slip dressing is still gorgeous, but ditch the Lolita style and go for Harlow—whether it’s satin, velvet or a clingy little knit number. The main vibe is to mix it all up—no, no matchy-matchy.» —“Festive dress” by Sandy Jaszczak Detroit Metro Times (Michigan) Dec. 23, 1998. (source: Double-Tongued Dictionary)