Cakes are pants

I have been craving cake. Nasty processed, sickly, shop-bought cake. But I have better things to do with my money. And we had most of a packet of ready roll icing (left over from the Lizard Cake) just begging to be finished off. I asked Creature what I should put on the cake and she said (of course) "Underpants!"

(p.s. this is not an A to Z post, could have saved it for 'U' I suppose.)