I haven't quite decided which seams will be piped (at least sleeves and back curves and neckline - maybe waist and wrists as well?), so I just made a whole load of piping, so I would be ready for whatever I decided to do down the road......
I used 2" wide strips of bias, and using a zipper foot, sewed against a core of cotton cord (some cheap white off-brand cone of cotton crochet yarn I bought about eleventy-billion years ago, like Sugar & Cream, but cheaper!)
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I ought to have taken pictures while I was doing it, but here is some awesome paint illustrations... :) The easiest way, I've found, to cut a moderate amount of bias is to open up the fabric:
and fold so the cut edge is matched up to the selvedge:
And at this point, you can cut the bias starting on the fold. If the fabric is thin enough, you can fold one more time, and cut through 4 layers. (Cutting bias is SO MUCH easier with a rotary cutter. I'd highly suggest using one!) The first cut on the fold should be 1/2 the width of the total width of the bias strip. Every cut thereafter should be cut the full width.
