IPA: /ˈtwɪnˌsɛt/
KK: /ˈtwɪnˌsɛt/
A matching outfit made up of a cardigan and a top, usually a sweater, that are designed to be worn together.
She wore a beautiful twinset to the party, which included a soft cardigan and a matching top.
Twinset → The word is formed from "twin" (from Old English "twinn", meaning double or twofold) and "set" (from Old French "set", meaning a group or collection). A twinset refers to a matching pair of garments, typically a sweater and a top, that are designed to be worn together as a set.
Think of 'twinn' meaning double or twofold, and 'set' meaning a collection — a twinset is a matching collection of two garments.