Hi, Fern
I also recommend Modesa (ex-C&A). If you are looking for special (dress) fabric, take a look at
LE COUPON
Storchengasse 10/Wühre 13
8001 Zürich
Tel. 043 456 30 01
Fax. 043 456 30 09
According to their
website, opening hours are
Sun, Mon: closed
Tue - Fri: 10.00 - 18.30
Sat: 09.00 - 16.00
I also made my own wedding dress

(but i bought materials in Italy).
Here is a link to an online shop which you may be interested in... (in German only, though). ENJOY!