Another "meh" here. It's got potential, but it doesn't hold up as well as the other X-Men costumes of the era. The arm-cape things are an interesting idea, but since it's implied that they're stretchy, the straight lines they create in a relaxed mode mess with the line of the costume itself.
I think the upper part could be helped if they widened the yellow to extend farther down the shoulder, while shortening the lower point to the lower ribcage and then add a yellow belt.