This is ridiculous argument and It can't get any funnier than this "he quality of denim comes into play when your riding horses, building a house or hitching wagons, not when your stepping onto a tram" -
If you're specifically looking for "baggy" (which could be more than one style) check out the boyfriend jeans at H&M.
Personally I like Vera Moda jeans but I don't know if they have baggy.
If you want the more "poop your pants pants" as I call them, you need to try trendier stores like Diesel, Globus (which has a wicked sale section with jeans marked down 75% when the sale is on), G-Star and Miss Sixty. If you're in Zurich head up to Niederdorf by the big church. As you walk up and to the left to the main street of the old town (sorry I don't know the name) there is a huge store just before you really get into the old town. It's on the right hand side and will have a bunch of joke/knick-knack stuff in the window. The shop opens into this huge space where you walk down a ramp into thousands of jeans, many reasonable prices.
One last place is ZERO in Sihl city, but their new collection is a bit blah.
I've long given up shopping for jeans in Zurich, I stock up when in London and Canada/the US.
I recommend this place:
http://www.american-drugstore.ch/
good selection of name brand jeans at reasonable prices. They have locations all over. If they do not have the size you want they shall order with no obligation in case it does not fit.
what if i need a size 24-25 and length about 32 for a woman? general where to buy smaller sizes for women in switzerland, where in zurich? price, brands dont matter, just it has to fit.
"peek&cloppenburg"
sihlcity shopping center
tram 5 (i think so)
good luck!
Did you have a look at the American Drugstore at Langstrasse?
I think I might have been drunk when I made the OP!