I am not Jewish, but I did help a friend plan her Jewish wedding, that she was unsure about too!!
I really don't think it matters what type of glass you use, most couples pick a glass they would like to keep as a memory...
As far as fabric, I think that again is personal prefernce, we saw somw kits online that were kind of expensive... so they could easily be done on your own!
As far as the glass, I did answer that above and my friends kept theirs as a keepsake...
Do It Yourself Jewish Wedding Glass Ideas
Any glass may be used for the Jewish wedding glass, although most couples choose a special glass to be broken and kept. It is commonly wrapped in a cloth napkin (to avoid dangerous glass shards) or enclosed in a pre-made cloth pouch. A “do it yourself†option is to purchase a single colored glass goblet to be used in the breaking glass Jewish wedding tradition. Look for a unique glass at a vintage or used thrift store. If you are planning on keeping the glass shards from the breaking glass consider colored glass instead of clear, especially if you plan to do a craft project with them later. Make certain the glass you choose is not too thick. It needs to be easily broken when stepped on! For this reason, stay away from heavy lead crystal goblets.
The Jewish wedding glass pouch can be a simple rectangle of fabric that you sew around the glass, much like a pillowcase. Close the third end with ribbon or sew it shut. Choose fabric that matches your wedding colors. Thicker fabrics such as velvet work well, but thinner fabrics can be doubled up. You don’t want them too thin or the glass shards will easily rip through it.
Good luck with your wedding planning….Mazel Tov!