ASTR the Label Cropped Striped Sweater - it's a size Small and in great pre-owned condition. This thing looks teeny tiny but it stretches a good amount.

Striped
Short sleeves
Knit & very stretchy
75% Rayon, 25% Polyester
Style: ACT11453
Bust 12.5" flat
Length 18"
Sleeve length 8.5"

#93