Some recommended wedding dress shops in Munich are:
There are about five shops on Sonnenstraße between Sendlinger Tor and...?
There is a small shopp hidden in the Asam Passage at Sendlinger Straße towards Kreuzstraße.
Brienner Straße, very close to Königsplatz. They have a few beautiful dresses in the window. Something a little different from the norm.
Ludwig Beck have very reasonably priced white ivory dresses. Possibly all under €300.
J. crew also has a simple but pretty wedding dress line. you can check them out online.
For wedding dress rental:
Try getting married in a Dirndl if you don't want white and flouncy.
Another TT Link for bridesmaids' dresses, if you don't want a standard wedding dress
Or try eBay. Any alterations made still save you hundreds of Euros. It takes the tradition out of trying one on and weeping though.
Related pages: