[UNDER-1 5 c.] A lining placed under something; the inner lining of a garment. Also fig.
1520. Hollyband, Vn haulse, the vnderlining of a shoe.
1631. Brathwait, Eng. Gentlew., 176. When the Moath shall be your vnderlining, and the Worme your couering.
1897. Daily News, 16 Jan., 6/5. An underlining of fine soft flannel makes them suitable for even the coldest weather.