look below my other production is make by 100%cotton,this knitted fabric have stretch effect because the Get Well Soon Damar Hamlin Caricature Shirt so you should to go to store and get this structure,it is weave loop by loop then fabric have stretch effect. Yes if the fabric construction and use allows it. Elastane is also know as spandex or lycra. The percent numbers only means it there. But not were it is. i.e. if they put elastane on a woven poly /cotton shirt and only use the elastane on the cuffs then,,,, No the shirt will not stretch. But if the elastane is in the fabric that makes the body of the shirt, Then yes it should stretch. So long story short. You have to know more than what the label tells you. In the future make sure to not place such items in a hot dryer. Drip dry and iron or if it was a little large, you can use low heat in the dryer. Yes. They are a simple garment. Garments are constructed by cutting then sewing fabric. Adjusting the fit or hemming a basic t-shirt is a beginner level sewing skill. You could likely buy a few things and watch an online video to learn the basic technuques including the hand stitches needed to alter a t-shirt yourself with scissors, a hand needle and a spool of matching thread.