Overhang will be trimmed. Sew your seam following the shortest piece. When you get to the corner piece, sew right over it. Make sure you back-stitch, or lock your seams.
- Now you are going to start a hem 8-10 inches from the end of a short edge. This is a double roll hem which should end up about 1/4-1/2" wide, but you will be sewing on your slowest speed and staying as close to the rolled edge as possible. Stop the hem about 8-10" past the other edge (to match what you did on the first side). Do not close the hem. We are creating a sleeve for the elastic.
- This can also be done with bias tape which is a little easier, but I like the cleaner look of this technique.
- Once you have finished the hem, trim your elastic to just over half the width of the short edge hem. Place a large safety pin through one end of the elastic and start feeding it through your hem sleeve. Once the unpinned end gets close to the edge of your starting hem, stop and sew it down into the hem on the end.