As a general rule, the weight or thickness of your interfacing should match the weight or thickness of your fabric. So, it is best to use medium weight interfacing with medium weight textiles, featherweight for light fabrics, and heavyweight for heavier materials. If you want your projects to look more professional, it is best to select interfacing based on the weight of the cloth you are working on and whether you need a soft or rigid drape. So, in general, please do not use a thicker weight interfacing than the fabric, as it will overwhelm the garment and impart an unnatural structure. For most dressmaking projects, lightweight interfacing is adequate. But, medium-weight interfacings may be a better alternative when working with stiffer cotton. Meanwhile, you can use heavyweight interfacing when sewing heavier fabrics or provide strength to apparel.