That is very interesting.
I bet they wanted to use them again. White would be impractical.
Unless you were wealthy you never had a wedding dress at all. You just wore your best dress with maybe a flower garland in your hair and left it at that.
Merchant class might have a veil that was used at all family wedding.
Wealthy people did have very nice dresses made but unless they were queens they expected to wear them more then at the wedding.