While online shopping is a popular past-time for most Koreans, there is not one specific website used for online shopping and no mail-order catalogs. If you enjoy shopping online and wish to continue doing so in Korea, your best bet is to make a date with your closest Korean friend and go internet shopping together. You can get some great deals on clothes and much more if you buy online in Seoul. Unfortunately, there aren’t English online shopping websites but some websites have an English option (http://www.gmarket.co.kr).
Expats in Seoul are usually so overwhelmed with the shopping opportunities on the streets that they don’t even think about internet shopping or mail-order catalogs, but it is the exact opposite with Koreans. Most will tell you that they only shop online. If this is truly something that you want to do, then any of your friends or coworkers can surely assist you.