What is the difference in fabric? *Knit- a lightweight cotton fabric normally used for t-shirts. Very soft,2 or 4-way stretch and static free. *Thermal knit- a soft cotton with 4-way stretch for a comfortable fit. This fabric is what is used for long underwear. It supplies warmth without being overly warm. This fabric will not collect static. Due to the large amount of stretch a less stretchy material will be used for the collar and cuffs to help retain the shape of the garment. *Sweatshirt: Very warm knit just like your favorite sweatshirt. Static free. *Velour- Warm and cuddly, nice stretch and static free *Smooth velour- Warm cuddly fabric with 2 way stretch and static free. This fabric is thinner than regular velour which is often found in lounge wear. *Fleece- 20% off as I am discontinuing this fabric. A warm synthetic fabric with 2-way stretch. Fleece is a great option for outdoor garments or cooler homes. Fleece has the greatest selection of patterns and I can normally accommodate special requests.