Free People All Lined Up mini dress size S

I love this but it was a little too tight in the bust for me. Just want to reposh and recover my $ to get a medium. (Tried it on after receiving it from posh buyer who sold nwot but didn't wear it out) Free People All Lined Up Blue Multi Striped Puff Sleeve Mini Deess Size S. Waist 15” Long from arm pit 20” Elastic waist Ruffled hem Open back with tying detail 54% cotton 20% acrylic 18% viscose Cotton blend woven 17