I feel like this is the dumbest question but I've been thinking about it for a while.
DS is almost 3.5 and can remove his pants, undies and socks... But he struggles with his t-shirt and singlet. Tbh, I have no idea how to teach him to remove his t-shirt. I cross my arms and pull my top up from the bottom, but he can't do that, his arms are too short.

So how do your DS's remove their tops??