Auburn, I love mine! I do agree YSL is on the closer to US sizing though. I'd say:
US Sizing > YSL > Jimmy Choo/Manolo Blahnik > Valentino/Prada > CL (I left out some, but just tried to hit generals.)
At least in the styles I wear, which are heels, so that is with a grain of salt. I can never figure out SW. Their sizing is just wonk to me no matter what.
Anyway, all the rambling means Anna you should be good as long as you are sock-less.