Delan Leather Bomber

Delan leather baseball jacket. Brand new tags still attached. Jacket measures 18 inches pit to pit. Is lined which make inside of jacket smaller. I would say this jacket would fit a size 6 comfortable. Not sure why jacket is marked a size 46. I purchased on YOOX. It fits me really tight. arms measure 6 1/2 inches width laying flat which means it's a 13 inch opening on upper arm. I would say 12 1/2 inch opening considering lining. It would fit a small size 8 fitted.