In reply to neilus:
Yes, Decathlon gear is generally OK, certainly for the price. A notch above Craghopper, for example, I'd say.
My experience, which admittedly is more of women's clothes, is that the more expensive brands tend to be a better, snugger fit. Cheaper brands can save money by making stuff a bit baggy all over rather than fiddle about and get a good fit in the right places (as well as using cheaper fabrics). How far up the brands you go to get what you want, and how much you put up with a poorer fit, is up to you!