The Book says, "Spaghetti tubing may be used to make button loops, spaghetti straps, thin round belts or ties, and many fashionable trims." So let's learn how to make these fashionable little tubes...
First of all, you're going to want a turning tool for this.
You can pick one up in the notions section at the fabric store. They have a little hook friend at one end and a big loop at the other. Becuase you'll be needing to turn such a thin tube, you'll need something besides the basic "saftey pin trick". This thing makes it all much easier.
Okay, now that you have your turner, grab some bias tape you've prepared at either 1.5 inches or 2 inches, depending on what you want. My understanding is that the thicker the fabric, the bigger the tape. Or something.
Fold the bias strip in half, right sides facing
Sew 1/4 inch for thinner fabrics, 3/8 inch for thicker fabrics, away from the FOLDED edge
Cut an end at a sharp angle, but don't trim seam allowance
Insert turning tool into the uncut end of the bias and work it up to the angled end
Grab the outer angle with the hook
and work the little sharp-movey-guy (the Book calls it a latch. You choose your favorite term) through the fabric 1/4 inch from the end
Close the latch.
Place the loop over a conveneint anchor
And start working the fabric right side out
whew. aren't you glad you invested in a turning tool?
and that's it.
If you're making a tie or belt, you can knot the end and cut off any excess