It might be difficult to use your curtains/drapes from the US in CH.
84" which is standard for a US panel is 213cm so you need to know the height of your ceilings.
If you have rod pocket curtains from the US and you have a track system installed in the Swiss apartment, you will need to add a nylon banding on your curtains so that you can use the track system.
If you are talking about drapes with a large rod pocket, you will find that the rods here are generally much smaller.
You can find some ready made panels here at Interio or MobilPfister - they are located throughout Switzerland so it shouldn't be too difficult to find one near you.
If you are in the ZH area check The Alt Fabrik in Wadenswil - they have a large selection of fabrics and can guide you if you decide to have something made. Ask for Carmella, she's fluent in English and very helpful. They work pretty cheaply also for CH
If you want to have something made and are in SZ check out Tevag in Altendorf and Robert Ruoss in Schubelbach (Ruoss has 3 floors of pillows, sheets, rugs and fabrics are on the 3rd floor).
I'm not affiliated with any of these shops, I'm just a drapery freak and this is all from my personal experience