A support garment is disclosed that provides improved support and restraint for a wearer's breasts. The support garment includes a breast support and isolating structure and an outer restraint bandeau that overlies the breast support and isolating structure. In a preferred embodiment, the support garment also includes an upper restraint band that extends horizontally over the wearer's breasts. The wearer's breasts are supported from underneath in a raised position, as well restrained from above. In this manner, the support garment of the present invention isolates the wearer's breasts so as to reduce irritation from chafing and sweating.