J Crew Mercantile Cotton V-Neck Long Sleeve Sweater - it's a size Medium and in good pre-owned condition although not sure if this is made with that worn look or not but this looks like it has wash wear (see last pic).

V-Neck
Long sleeves
Ribbed neckline, hem & sleeve ends
Side slits
100% Cotton
Bust 18.5" flat
Length 25"
Sleeve length 23.5"
Style: H4686