I am a 6.5 in almost all of my shoes, with the very rare size 7 and normal/slightly large ankles for my foot size. I sized up to a 7 as others have suggested, and the sandals fit very well. I can close them to the second hole on the ankle clasp and the sole fits my foot at exactly the right spot. these sparkle SO much!

I have only walked around slightly in my wedding dress, but I haven't noticed the rhinestone settings grab at all. I have a satin linter on the inside of my mermaid style dress that may help keep the fabric weighted and away from the shoes, so be aware that the fabric on the inside of your dress may help decide whether you can use these or not.