knitwear mini dress Callahan Bow Fabric 60% cotton Solid Color Sweater Dress Half

Jacket has two buttons w/ rhinestones, one button is missing one of the rhinestones

White or light blue for business formal

They actually stock a range of silk and slip dresses which could easily be repurposed as gowns for your bridesmaids

Look for dresses made from fabrics such as jersey, modal, or synthetic blends that are less prone to wrinkling and will retain their shape and structure even after hours of wear

That's Jehovah's Witnesses you're thinking of

Obviously it all comes down to personal style in the end, but hopefully this post will give you some ideas of where to start when looking for white sneakers and styling them with dresses