Topshop grey coat NWOT

Topshop grey coat, in perfect condition I wore this coat once, briefly, but didn’t like how tight the arms were on me. I’m usually a size 6, don’t know why I bought a size 4. Has a fur detachable that buttons on to the collar (or you can wear it without) You can button it on either side you want. Very form fitting when buttoned (as pictured on mannequin) Measurements: Length-41.5 inches or 106.3 cm Waist- 16 inches or 41 cm Shoulders- 15.6 inches or 39.5 cm Arm/ sleeve- 24 inches or 61.5 cm Armpit to armpit- 17.5 inches or 45 cm