PC.net

LST

Meaning Long-sleeve t-shirt
Type Acronym
Rank ★ ☆ ☆  Uncommon
Usage Online Only (chat, messaging, e-mail)
Comments

As opposed to a short-sleeve t-shirt.

Example "It's a little chilly outside 2day, so I'm going to wear a LST."
Updated August 14, 2019
Information from PC.net
https://pc.net/slang/meaning/lst
space