Recently I've been working on a new costume and it's required some rather fiddly sections of bais stitching. Now I'm not being lazy and using bias tape, the costume is actually trimmed in a different colour so bias seemed the sensible option! Anyway I was asked how I got it so neat, especially round the tricky parts so I thought I'd knock up a quick tutorial.Now the pictures I've used are of a relatively simple curve, but you can use the technique for any shape! Also I'm sure there are plenty of other methods out there, but this is my current fave for tricky things.
Step 1:First take the main piece and turn it over so the back of the fabric faces you. Then take the bias tape and unfold, pin the very edge of the tape to the material, so the right side of the tape faces the wrong side of the fabric, (see the pic below of that doesn't make sense)