Abstract: A bra structure for use in reducing the risk of truncal lymphedema after unilateral mastectomies. The bra structure includes a compressive layer that provides compression around the residual breast via a hole in the layer, the mastectomized site, the back, and the left and right axillae. This allows the breast to pass through the compressive layer without creating a pocket between the fabric and sternum where lymph fluid could pool. The structure also preferably includes a fabric overlay on top of the compressive layer that includes a cup to hold the residual breast.