These are cut and sew designs. Any knitted fabric may be used.  Interfacing may be helpful to stabilize some fabrics. Any gauge may be used. These are a  real classic in  the handbag  world but only  recently have  frames been  available to  allow us to  make our own. Frames are available from very in-  expensive and simple to quite elaborate and pricy.  I suggest that you start with the basic frames in  coin purse sizes to perfect your skills before investing in fancier frames. All frames of this sort  have a channel into which the edge of the fabric  fits. Some  also have  holes to allow  the fabric to  be stitched  through the  frame. The  no-hole variety require  glue to do the  entire job. I  use Allen’s  Clear Gel or  Fabric Tac  Clear Glue for  jobs like this.  3-11” wide