Well, it depends on your personal taste and how much you want to spend. Here are some suggestions in different price ranges:
● Fashion brands in Scandinavia (= Denmark, Norway, Sweden):
Baum und Pferdgarten, Bruuns Bazaar, By Malene Birger, b.young, COS, Dale of Norway (traditional knitwear), Day Birger et Mikkelsen, Designers Remix, Filippa K, Fjällräven (functional outdoor clothes and equipment), Ganni, Gina Tricot, Gudrun Sjöden, Helly Hansen (outdoor clothing, sportswear and streetwear), H&M Trend, InWear, Kari Traa (fashionable athletic wear), Mads Nørgaard, Munthe, Noa Noa, Oleana (colourful creative knitwear), Saint Tropez, Samsøe & Samsøe, Vero Moda.
(Haven't time to write a description of each of them, but recommend that you check them out on the internet. Check out the famous Finnish brand Marimekko, too.)
● Jewellery:
In Scandinavia, you will find large selections of high quality silver jewellery. (Famous Danish brand: Georg Jensen.) Finland is well-known for jewellery in interesting combinations of wood and metals. And in most of the countries you will be visiting you will probably see beautiful amber jewellery that is rare in many other parts of the world.