tsharer: Brides wearing white gowns is an original Jewish custom mimicked by the goyim.
Yserbus: When do we stand up for the Kallah? That is unusual by frum weddings. (Other than by the chupa when you stand up for the Chosson when he walks in and remain standing till everyone’s under the chupa. But that is clearly the Jewish minhag of Choson doma l’melech, a choson and kalla are king and queen.)
This bridesmaid business is a clear chukas hagoyim, as akuperma and others pointed out.