I think you should be fine. I'm a 7.5 and found the SS to be a little big on me (size 8). The embellished (studs and glitter) SS fits like a glove so those styles might be a little snug but I'm sure they'll break in.
I am a size 8 US in nike sneakers and I ordered a 38 in gg superstar. Will I be fine?? Thankyou!