Most people coming from Spain assume that the right of return applies here too. In the EU, if you buy something in a high-street shop and want to return it, you have specific time limits and recognised rights. Not so in Switzerland. The Swiss Code of Obligations does not provide for any general right of return or exchange. A shop is perfectly entitled to refuse to exchange an item of clothing that is in perfect condition, even if you have the receipt and bought it the week before. Legally speaking, they are in the right.
Some large chains such as Migros, Coop and Zalando voluntarily offer a 30-day returns or exchange policy. However, they are not obliged to do so. What they offer today may change tomorrow, and their terms and conditions may contain exceptions for hygiene products, promotional items or underwear. The situation is the same with Swiss online shops: a .ch domain does not guarantee that they apply the European 14-day withdrawal rules. That only applies if the seller is based in the EU.
What does exist, and is laid down by law, is the warranty for defects: two years for new products, one year for second-hand ones. If the item is faulty, you can demand a repair, a replacement or a price reduction. But that is a warranty for defects, not a ‘change of mind’ return. Many people confuse the two concepts and turn up at the shop with arguments that don’t apply here. If you want to make sure you can return something, ask for this in writing at the time of purchase, or choose shops that state this clearly in their terms and conditions. And always keep your receipt.