-4cm on the length combined with lowering the buttoning point 1.5cm seems off to me. I wouldn't shorten that jacket more than 2cm unless you really want the trendy short jacket look. Buttoning point looks pretty good as is. Maybe a hair lower. -2.5cm on the waist also seems like a lot. Maybe a little less out of the waist and then reduce the back of the chest to get rid of some of that extra fabric?
11/7/14 at 5:27am