Calvin Klein Size M (?) Maroon button down long sleeve shirt

Calvin Klein Size M (?) Maroon button down long sleeve dress shirt can dres up or dres down leave buttons open for a lightweight cardigan or wear buttoned up as a shirt NOTE light pit staining. I didn't try soaking in vinegar, this might get it out? not sure but priced due to this. buttons on wrist, mid arm so can wear rolled up as 3/4 sleeves as well roll up button detail on side bottom button details on shoulders as well! 2 functional front breast pockets! pit to pit: 20" size help: I am an average size large now with 36 b and this fits me but slightly too tight for it to be comfortable buttoned