twinset
nounUK /ˈtwɪn.set/
US /ˈtwɪn.set/
A matching sweater and cardigan that a woman wears together.
She wore a soft pink twinset to the family lunch.
OTHER MEANINGS
2. A pair of matching items sold or used together.
The shop sells a twinset of cushions for the sofa.
3. A set of two related things that always go together.
The twinset of rules and rewards keeps the class calm.
4. In British usage, a matching jumper and cardigan worn as one outfit.
Grandma knitted a twinset for the winter.