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Calvin Klein Modern Cotton Unlined Wireless Bralette ($19, originally $30)

Calvin Klein is one of our favorite destinations for shopping out new intimates, and this style is one of the brand's bestsellers — with over 19,000 reviews to support its popularity. The lightweight layer is designed for all types of cup sizes and shapes, as it's made from a stretchy cotton material that's supportive yet still breathable. You can wear this around the house as a bra for lounging or throw it on as a sports bra for your next gym session.