Single fold bias tape is commonly used on armhole and neckholes, or to make a casing for elastic. In this case, I was using it to make a little pair of panties for the little gal to wear under her Easter dress. It's used on the leg hole and creates a casing for the leg elastic to go in.
First, open one edge of the bias tape and pin it to the outside of the garment along the leg hole (or arm hole, etc.).
Next, turn the garment inside out and fold the bias tape to what is now the outside of the garment.
In this pic you can see how it's folded. The part by my fingers need to be folded in like the rest of it.
Sew along the left edge of the bias tape, making a casing. Be sure to leave a small opening so you can get your elastic in there! (Sorry, no pic of this step).
Insert your elastic, sew the ends together, and close the small opening you left.
Repeat for the other leg, and then turn it right side out!
There! (yes, she is wearing them!)
See? Bias tape isn't so bad after all, is it? We'll do double fold another day. It's even easier :-)