singlet

A man’s jersey undershirt.

A multiplet with a single member.

An unlined waistcoat: opposed to a doublet, which is lined.

An undershirt or undervest.

An unlined or undyed waistcoat; a single garment; — opposed to doublet.

A vest; a sleeveless garment with a low-cut neck, often worn underneath a shirt.

A multiplet having a single member, especially a single spectroscopic peak.

A quantum state having zero spin.

a collarless men’s undergarment for the upper part of the body