I'm sure my wife will chime in eventually in this thread.
She got a used dress pretty cheap but it needed sleeves. So, the Mormons to the rescue!
Notice that site "Elizabeth Cooper Design out of Utah". That "Utah" isn't a coincidence. I'll bet you a chocolate chip cookie she's a Mormon.
For us though, we just needed an accessory to make the dress modest. Some online site had "temple-ready" dresses and accessories. She bought some kind of top with sleeves to go under the dress, which matched the wedding dress perfectly and made the whole thing perfectly modest. We still have the dress actually. Taking up a lot of space in our humble closet. She's hoping to pass it on to one of our daughters.
Google "temple ready". It's not like you have to actually use it in a Mormon temple. You're perfectly free to have your wedding elsewhere...hahaha