You can find jackets that look like this at any shopping mall in Korea, especially the underground malls. Try the underground malls connected to the subway stations at Yeongdeungpo (Times Square shopping mall stop) or Bupyeong (Incheon, towards the end of subway line 1) if you're in or around Seoul. Also Myeongdong's big shopping mall directly outside the subway exit or Dongdaemun would have shitloads of stuff like that.Okay, I'm gonna try to hunt it down then.
Don't expect fantastic quality. But at least you'll be able to try them on in most cases, and they'll be cheaper than the ones on eBay too.