How to sew a gusset (for sleeves)
Added Nov 22, 2010
You may find that your corners don't quite match perfectly - this can happen, since this sort of sewing is a bit fiddly. You may also find that, like me, you would like a little bit more reinforcement at the corners of the gusset, to make sure there's less chance those corners are going to tear with wear.
It's time to grab that needle and thread! Sew using a backstitch along your seam at each corner. 1cm each way is probably a safe length.
(For instructions on how to backstitch, try this website: http://www.mahalo.com/how-to-back-stitch)