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Brenna Carver (Haley Ramm) wears this lace long sleeved sweater cropped top in this episode of Chasing Life.

It is the Vena Cava Navy Lace Mirabella Sweatshirt Top. Buy it http://www.lyst.com/clothing/vena-cava-navy-lace-mirabella-sweatshirt-top-1/