Materials (i assume you mean clothes of fabrics) are stretchy due to the amount of elastic in the fabric. More elastic means stretchier fabric, less elastic means it will not be as stretchy.
Using elastic thread in the bobbin doesn't make the material gather, you have to do it yourself. This is called shirring. You'll need to use a zigzag stich, make several rows of stitching, secure the top thread and the elastic thread on one edge of the fabric and then pull the elastic threads on the other edge to produce the gathering or shirring.
The best techniques for working with crochet elastic fabric include using a smaller hook size, stretching the fabric slightly as you work, and being gentle to avoid overstretching or distorting the fabric.
capable of resuming original shape after stretching or compression; springy; "an elastic band"; "a youthful and elastic walk" rubber band: a narrow band of elastic rubber used to hold things (such as papers) together able to adjust readily to different conditions; "an adaptable person"; "a flexible personality"; "an elastic clause in a contract" a fabric made of yarns containing an elastic material Lauren =]
A hair elastic is a small, typically round band of stretchy material, such as rubber or fabric, used to gather and hold hair in place. It is commonly used in hairstyles to secure ponytails, braids, and buns.
nayon
Yes, polyester can be elastic. It can be combined with other fibers like spandex to create a stretchy fabric that has elasticity.
No. Neoprene is a material as are cotton and silk. A fabric is made out of material.
To crop a shirt using an elastic band, first fold the bottom of the shirt to the desired length. Then, wrap the elastic band tightly around the folded fabric. Adjust the band to the desired tightness. Finally, cut the fabric above the elastic band to create a cropped shirt.
Knit fabrics can shrink or extend if a rib construction, have nap, have ribs/wales and are generally more elastic along the course. Woven fabric is interlaced sets of yarn that are not very elastic.
You use 1" more than the waist you're sewing for. This allows for a 1" overlap to sew the elastic together securely. Answer two: Per this entry from Threads Magazine online: The length of elastic should be shorter than the waist seam (after seams and darts are sewn). How much shorter depends on the combination of fabric, lining and elastic. On lightweight fabric with lightweight lining, use clear elastic, and pull the elastic gently as you sew it in place. If the fashion fabric is corduroy or cotton twill with a medium lining, use braided elastic, and stretch the elastic more as you sew it in place because heavy or firm fabrics put more pressure on the elastic. http://www.threadsmagazine.com/item/3740/how-to-shop-for-elastic
no its a fabric