I have a word of advice for anyone considering putting leatherette piping in a garment.
There, I think that just about covers it ;)
Haha, I'm kidding... but seriously now, leather/ette detailing is pretty hot right now and adds a smart urban edge to the most ordinary of garments, so I made some to put into my latest project.
It's fiddly but I think it'll be worth the effort.
When sewing around a sharp corner, clip into the corner before pinning the next section in place, and sew each section as a separate little seam.
Same goes for sewing around a curve. Go slow and check everything is sitting just as it should frequently. There is no shame in hand-cranking the machine, stitching just one stitch at a time! Those needle holes are permanent.
Obviously when sewing in tight corners and curves, pick a nice, long-enough section of the piping with no joining seams. No point in making it more difficult for yourself than it is already. Only use those bits on long, straight easy edges.
Leatherette does not fold into a sharp edge or point, and even on the bias will not naturally stretch out smoothly around curves either, like a woven fibrous fabric would. But it does give a nice, softly rounded edge when turned out. I like the bluntness, am very pleased with the contrast in textures and think they'll lend a certain je ne sais quoi to the final garment. Hopefully. :)