A S.
Looks good except I could not get the bow to continue looking good when I move around. While overall this size(large) fits me well, it is too short(I'm 180cm long) so I cannot close the bodysuit with the buttons on the bottom but it still feels great to wear nevertheless.
The skirt's material feels slightly cheap (I mean 30€ for the set *is* cheap) but it looks good and was still a joy to wear.