LST
LST definition by Slang.net - The Slang Dictionary
This page explains what the acronym "LST" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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LST is an acronym that stands for "Long-sleeve t-shirt," which is simply, a t-shirt with long sleeves instead of short-sleeves. It is most often used in text messages and online.
LST is one of those acronyms that is incredibly obscure, which is why you're here trying to figure out what it stands for. You should only use it with people who know texting lingo otherwise you will most likely confuse them and have to take time to explain what it means.