Also backpacking in Switzerland is nowhere near as prevalent or easily accessible as backpacking in the States. So the US has a huge plethora of resources for this, I would stick there.
If you want my recommendations for lightweight (ultralighting is not something you want to do to start, ultralighting is not just "light gear", its an entire philosophy that is pretty far out there) gear, here you go:
Tent: something from https://www.tarptent.com/
Stove: I like my little Optimus Stella, the integrated jetboil things work well and are worth the size/weight
Food: just need 1 titanium cup, Snowpeak makes a good and cheap one that will last
Clothes: get what fits at REI. Patagonia baselayers are incredible. Rab Neoshell jacket for inclement weather/fall/winter/anything you ever need camping.
Sleeping bag: too bad GoLite failed, their bags were amazing for the value. Go for a Marmot bag, the Marmot store is close to you in the Bay Area (Berkley I think?) and they have great bags. You don't need a cold weather bag unless you're doing High Sierras in the snow. Then all of the above can be modified.
Enjoy and get out there as much as possible.