Green’s Dictionary of Slang

(UK juv.) in pl., underwear.

1972		B. Rodgers Queens’ Vernacular 203: scants (fr scantie) bikini style undershorts.
1990		P. Hotz Muzukuru 5: Someone goois a grenade [...] The lootie – in skants – races round shouting instructions.
2001		OnLine Dict. of Playground Sl. 🌐 scants n. underpants.