When I was a kid I once borrowed my dads bike for a short trip to the shops. I couldn't understand the laughter I was getting from my mates all the way there and back until I got home to discover the old pair of y-fronts he'd used to wipe the bike down, strung over the rear reflector.
If you must use old clothing, stick to t-shirts.
If you must use old clothing, stick to t-shirts.