Abstract: A brassiere underliner fittable to a brassiere to allow absorption of perspiration of the user. No modification of the brassiere is needed. The brassiere underliner fits under the breasts of the brassiere user and has greater thickness and rises higher in between the breasts to capture a greater amount of perspiration between the breasts. The underliner has curvatures that are contoured to fit the curves of the undersides of the breasts. A tacky adhesive retains the underliner in position on the brassiere. The underliner can be disposable, thereby allowing quick replacement as necessary and avoiding potential embarrassment. Further, the use of the underliner limits soiling of the brassiere, hence extending the life of the expensive garment.