amazing pattern drafting site for stretch fabrics, etc; not sewing 101 but great info all over the place. This piece in particular is a WOW, wet-suit engineering taken to the next level by reducing pockets of air and making more close fitting
Instructions for : Attaching your dolls head can be done in one swift movement! This is my favorite method. I love that the doll's head can swivel. I use 2 needle/ thread and secure thru a button on top of the head.