Heat n Bond!
Or some other type of iron on transfer. It's similar to no sew tape, but you iron it on so it's much more permanent. And you can get it at any craft store; I think even Walmart sells it.
It comes in varying widths and you don't have to worry about any stitches being seen.
I bring a roll of it to every convention because it's also handy for quick fixes.
(Just So you have an idea of what it looks like) My friend and I used it for the purple and gold edging on these costumes.
Her's is a little puckers in some spots because the gold ribbon she used was fairly stiff and awkward to work with. But it got the job done.
She's also used it to put stripes on her Deadman Wonderland Minatsuki bloomers.
I hope this helped!