I am a bridal seamstress. If you plan to use pieces of your wedding gown....seam finishes are a must. Lots of satins fray and many are not made for hard use. If it is a heavy satin, you have many more options than you do with a light weight satin. Adding splashes of beach colors will be beautiful. I would try to find the same type of fabric, like satins and not mix it with cottons that will handle more wear and tear. Many satins are now washable and you may want to test yours by washing a small piece first. Pay attention to the washing instructions on the fabrics you put with it. You could dry clean it to be sure. I would love to see pictures when you finish it.