Mudbound 2017

About 57 minutes in, the liberation of Europe in WW11, a US serviceman is in bed with a local. She's wearing a white fullslip with lace at the bust; they get out of bed to look out of the window and the slip is seen from the rear, the camera doesn't get low enough to show the hem.

Found a still:
http://78.media.tumblr.com/40bbe47806f87a064b16a843624159fb/tumblr_ozmqcunOrD1s8esgpo4_1280.jpg

The actress is called Samantha Hoefer.