hi there! The process is exactly the same. If you want a contrasting binding, you just have to purchase a contrasting, similar fabric but you would still do everything else the same.

I think I see what you’re saying. As far as I’ve seen, there is no bias binding that you can buy that’s like woven bias tape for stretchy fabrics, so the process is a little different. And because you’re already working with a stretchy knit you don’t need to cut the binding pattern on the bias. If you want something similar to the striped tank, I would just make the binding a little wider, so after you stitch it to the armhole, you can then fold it back over to the wrong side and then double stitch it. So the folded edge of the binding ends up on the inside of the tank top, giving you a neater look. I’ve done this for a few of my tank tops and it has more of a similar look. For double stitching you can purchase a twin needle. I hope that makes sense. 🙂