Slub/slʌb/ Definition 1 of 2Pro Tip 1/3Textile Texture Slub in fabrics adds a tactile quality that can be felt as well as seen. I love the slubs in this sweater; they add a cozy feel. Pro Tip 2/3Fashion Style Slub fabric is often used in fashion for a rustic or casual look. This slubbed t-shirt looks casual and feels comfortable. Pro Tip 3/3Unpredictable Flaws Slubs are sometimes seen as imperfections, but can be intentional for style. The slubs in these curtains give them a handmade touch.