I am all for dress comfortably on an airplane, especially on TPAC/TATL flights. However, if someone clothes needs constant readjusting to avoid revealing too much then I think it is inapporpriate. Case in point, I was flying back from LHR last week in C, my seat mate was wearing some low cut sweat pants that she needs to pull her pants up everytime getting in and out of her seat. Come on, wear something that will cover all your private area please!