went to switzerland for a short business trip. liked their yarn shops a lot and i did not even go to vilfil for their cult selection - as i had just a lil bit of time, i only visited manor at the bahnhofstrasse and coop nearby, plus another manor dept. store in nearby winterthur.
i am sure there are even bigger shops but i was very satisfied - they carry a big selection of nice natural yarns that are not available in prague (where it is easy to get acrylic but nearly impossible to get one's hands on alpaca, camel etc. and the wool selection is still limited).
bought a ton of grey and muted jawoll and other brands, and also some white-ish stuff from the private brand at manor, called maddison. it is a totally nonscratchy wool that requires thick needles and is quite good.
jawoll is brilliant although someone migh find it scratchy for next-toskin project, but i love it because it is a totally classic and classy stuff. more on this later.