the seamstress place is run by a little Greek lady it's called Olympia (it's a pokey little shop with a blue and white sign) and it's on Schwanthalerstr. just up on the right hand side past Saturn and Hansa walking away from town. at the moment she's on holiday til the 31st of August.
perhaps you can buy the zip (
Hertie's good) and pop along to her. cuz it's on the front of the
dirndl it needs to be machine-sewed on which is really fiddly to do, she's got the right machine for it!