Leg Avenue Halloween Costumes

I wonder if anyone has bought a costume Leg Avenue. I'll probably buy one of the retro go-go girls, but I do not know what size to buy. I am a size 8 and I do not know if I should go with the S / M or M / L. Advice?

I'm hoping to get the sailor pinup costume (so cute!) Annd my sister last year has been one of the army pinup
It was really cute and looks great!
they have measurement cards so you can see exactly what your actions will shape or wahtever
I think you might be the M / L
but I'm not Suree