To provide a lady's swimming suit capable of concealing scars such as ones caused by a surgery operation for breast cancer, ranging from an upper arm part through the shoulder and breast parts, capable of trimming the difference between the sizes of the right and left breasts, and causing no sense of incompatibility in its appearance and wearing feeling.

This lady's swimming suit comprises a neck part 3 designed so that a portion ranging the upper arm part through the shoulder and neck is successively covered with fabric, and a trimming member fitting part 5 designed so that a breast part trimming member 10 for adjusting the difference in shape between the right and left breasts can be attached inside the breast part.