Souvenir shop recommendations with XL sizes or larger

Trying to find shops that have souvenirs like a license place, mugs that say Tokyo or Osaka, magnets and shirts and sweaters but for larger people. I’ve been to don quixote in Akihabara and didn’t find anything really. I’ve also checked out Hands, but only found cool trinkets but not the above listed. Hoping to get some suggestions of other places to try in Osaka but mostly in Tokyo? Also being from North America I know that Japan’s XL is actually closer to an L for us which makes things a bit more difficult. Went to a mall in odiba and their adidas store had LL or something which so far on my trip I think has been the largest size I’ve seen.

Thanks in advance!

by FitAngle651