Stockmann is known for it's higher class products. I have written before about Stockmann being a good place to get testers in cosmetics becase the service is fantastic!
Stockmann has also a small exhibition hall in the 5th floor - Argoshall. There they have different kinds of theme "exhibitions" where they sell the products as well. This time there's going to be something that might interest you, if you are curious about young Finnish designers: Argoshall and Aalto University organize every year "New Fashion" exhibition.
New Fashion includes works from 24 different designers. Also the lighning and the venue will be designed by Aalto University students.
Stockmann, 5th floor
FREE of charge