This Freewheelers Mulholland shown above looks absolutely gorgeous but I suppose it might fit like trim fitted size 40 or like comfortable size 38 considering its measurements and which is more important - having these measurements it has woolen lining, so inspite it's marked like size 42 on jacket's sizetag - it seems to be more like size 38-40. It's very trim fitted pattern by its own, esp. in its armpits and waist areas. Its size marked as 42 isn't an american size at all but is japanese one, that makes sense too. I don't think it might loosen while wearing, it's made of Shinki HH which usually tends to shrink a bit after lots of wear. I'd suggest to sell this very nice jacket to anybody who has suitable size (38 or trim fitted size 40). Be careful with your attempts to stretch the jacket 'cause stretching attempts might ruin jacket seams.