twinset

or twin set

[twin-set]

noun

a matched sleeveless or short-sleeved sweater and cardigan sold to be worn together.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for twinset

Contemporary Examples of twinset

The most recognizable collaborator is Tilda Swinton, whose green twinset she titled, The Twinset of My Dreams.
Tilda Swinton, Uncensored
The Daily Beast
September 21, 2010

British Dictionary definitions for twinset

twinset

noun

British a matching jumper and cardigan

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012