I am trying to find ribbing material for neckline on shirt any ideas?

Joanns usually carries it in several colors- usually purchased by the inch, you cut the strip the width you need, fold in half and stitch on the garment.

You can also use a piece of the knit from your article. Not as good as the actual ribbing, but in a pinch!

I buy it at Hancock Fabrics. Just ask and they can show you where it is.