The 40 is clearly too small and too tight.On both coats, button only the top button.The 42 looks much better. I would not make it any tighter.My only concern is the length of the coat. It seems to be just barely covering the "seat".There is a gap in the collar of the 42. Maybe, unfastening the bottom button will fix this. Also, pull, tug, the lapels down and see if it makes for a neater look. Good luck!