Originally Posted by grammyp
I would concentrate on the pattern and contrast. Use colors as usual for the non color blind, but make yellow a focal color and be sure there is a nice contrast so he can see the pattern. You could take a selection of fabrics for him to see and let him help with the contrast.
Good advice. My DH is colour blind and several people here have already described how it is.
Quilterguy27 - that's hilarious about the red/yellow flashing lights. It's so common that I often end up wondering why emergency vehicles haven't changed. My DH has trouble distinguishing the traffic lights from those orange street lights now being used so I do all city night driving. He uses lots of traffic cues! Also notices a TON of things that I miss, especially when walking in the woods.