Sapporo is the most modern city in Hokkaido where quite a lot of shopping malls are located, including Parco and Alta. You can find a large number of famous brands such as Vivienne Westwood and Frapbois in the malls. Not a fan for fashion? Search for funny merchandises more than costumes and cosmetics in Tokyo Hands.

Parco - http://www.parco-sapporo.com/web/shop_topics/

Alta - http://www.altastyle.com/sapporo/index.html

Tokyo Hands - http://www.tokyu-hands.co.jp/sapporo.htm