Knitted bra. This would be so pretty under a soft knitted loose top.

Women's UA Seamless Low Long Sports Bra

Women Cute Valentine Heart Graphic Jumper V-Neck

Maternity Soft-Knit Nursing Bra

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The Simple Bralette - English – nakedknit

Knit Bra Top – Holland Designs

Soft-Knit Bralette Top

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The 11 best bralettes for any size, tried by editors