Depends on if the skimpiness is excessive.
Some men are prudes who want their girl to wear sweatpants to the beach in the summer, but some women are slvts that would go outside in lingerie and a trenchcoat during the winter.
Also depends on if the posting itself is excessive or not.
There's a difference between daily selfies where she pulls down her pants to show off her ass and thong in a mcdonalds bathroom while at work, versus posting in a bikini at a beach trip. Or wearing short shorts during a heat wave.
In the end I think some guys need to get with the times, it's not 1942 anymore, your woman being sexual and sexy is a good thing unless your crippling insecurity is a bigger deal than having an attractive girl you can have fun with on your arm, etc.
As long as she isn't allowing or inviting other men to get some while you two are committed, and she dresses sexy for your benefit rather than primarily for others
Also most of the women I know who wouldn't wear something sexy have crippling insecurity. It's not that they're super good girls or anything, they're basket cases when it comes to their body and appearance.
Ironically a lot of women who self righteously take pride in """not being that kind of girl""" are just virtue signaling (whether it comes to dressing slvtty, having sex early or easy, etc.)
example: girl 1 I knew would always call girl 2 a slvt looking for attention behind her back because girl 2 was obsessed with crop tops and wore them even in the winter. in the end girl 1 ended up cheating on her boyfriend and girl 2 was 100% loyal. Funny how that works out huh?