singlet
noun /ˈsɪŋɡlət/
/ˈsɪŋɡlət/
(British English)- a piece of clothing without arms, worn under or instead of a shirt; a similar piece of clothing worn by runners, etc.
compare vest背心;无袖汗衫;运动背心 词源mid 18th cent. (originally denoting a man's short jacket): from single (because the garment was unlined) + -et, on the pattern of doublet.