Getty

Florence Pugh is firing back at people who opined on what they thought of her body -- specifically, her breasts -- when she bared it all in a see-through dress this weekend.

The actress was in Rome Friday for a Valentino Haute Couture fashion show, where she donned a pink getup on the red carpet that was about as sheer as it gets ... especially upstairs. Indeed, her chest was on full display -- and FP decided to go braless for the night.

Getty

It turned heads in the moment, no doubt, but it also apparently got a major reaction online ... especially from men, who Florence is now putting on blast for what she says were chauvinistic and disgusting comments -- some of which sound like frat boy talk.

Florence took to IG Sunday with three BTS photos of herself in the gown, and added a lengthy caption. She says she knew what she was doing and that the dress would get a reaction of some sort -- but that she didn't care, and wasn't nervous about it at all.

Waiting for your permission to load the Instagram Media.

ncG1vNJzZmivp6x7tbnZZ5qopV9nfXN%2BjmluaGlgZLOtu9GepZydXaXCqLSMm6Oaq6SoeqS%2ByK2gnKtdpLNutMSrZJuqlZbAtb%2BMrJyeZaSdv7DBxqFkrKCVmr9uvMinomacoprAtHs%3D