How to Avoid Visible Panty Lines Under Fitted Clothes UNDERNEAT Replying to @Joy Trehan how prevent panty lines from showing. these are the underwear i mostly wear in order to prevent a panty line from peeking through my outfit. These work well under white, see How To Avoid Underwear Lines La Coochie how to hide visible panty lines! just wear whatever is comfy and do not give a f (but seriously, when ur bra strap shows its a bad look, when your nipples show