I think I should start since I asked.
1. Food. We produce a lot of food so even the Poles who don’t care about supporting polish econamy buy those products daily. In my case I once wanted to buy hard cheese and after noticing it’s imported from the Netherlands I put it away (nothing against the Dutch!). It’s different with products we can’t produce in Poland, like olives, olive oil etc.
2. Cosmetics. As for skincare, I mainly buy from polish brands (usually dr Irena Eris) but not everything. I especially like Korean Benton brand. I try to find polish cosmetics with similiar ingredients but it doesn’t always work out. As for things like shampoos, soaps, shower gels, I go for polish brands.
3. Clothes and shoes. I don’t care much. I buy what I like. Swedish brand Didriksons jackets are the best winter jackets in my opinion (have 3, same model, different colors), Japanese Annello backbacks are immortal (have 4 in different colors). However, I do feel slightly happy when I buy something from a polish brand.