Interlining is a layer of knitted, woven or non-woven fabric placed between the garment fabrics and facing to reinforce, to give form and to prevent stretching. They are usually used for collars, cuffs, waistbands, pocket flaps and plackets. In this study, the woven fabrics and the woven interlinings that are usually used for shirts manufacturing were examined. 4 woven interlinings and 3 woven fabrics, that have same constructions but different weights were determined. The aim of this paper is to research sewability properties of different woven fabrics fused with different woven interlinings by using the L&M Sewability Tester. The findings were associated with the penetration force, fabric unit weight and fabric thickness. It was found that when the weight and thickness level of fabrics increase, the resistance to sewability increases, too.