I went back and forth on whether or not this was actually a transferred epithet. (In the end, because it’s here, I decided that it was.) It’s the word ‘crew’ that throws things off; if it were just ‘Diabetic Socks’, then it would definitely be a transferred epithet. But the double adjective isolates ‘Diabetic’ more and so suggests more ambiguity: socks for diabetics? still a transferred epithet? probably, but less definitively.