Harry and Meghan's wedding is going to be "all about them" and basically everything before and after is for the firm so, for Meghan, this could be her last grand hurrah where she gets to wear the wedding gown she always dreamed of without any pressure to be a walking advert for a UK Couture House.
On a personal level, I have always thought that the dress should be about her and her dreams. For a start, she is not British, she is an American and she should be able to embrace that and express herself the way that makes her feel like the woman that Harry fell in love with and knock his socks off at the same time.