My 10 Sei 0 Otto size 48 fits quite snug and I have a 37" chest, so assuming they follow most sizing conventions and go up 2" per size, a size 50 would be slim on a 39" chest, and size 52 slim on a 41" chest. If you're 42" I would probably go for a 54.. I know if I was 1" larger my 10 Sei 0 Otto would probably be too tight.
Styleforum › Forums › Men's Style › Streetwear and Denim › Leather Jackets: Post Pictures of the Best You've Seen/Owned?
Leather Jackets: Post Pictures of the Best You've Seen/Owned? - Page 494
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