Normally, when a kid gets mad over something it can't have, you don't buy it back from them, but Pekka never had kids and isn't comfortable with seeing the little girl naked.
Diplomacy! Pekka style! As in, the trolls like Pekka's style of clothing!
If trolls like your style, it's a good time to question your choices.
I can see it now, little Troll girl proudly marching all around in her spiffy new Leprechaun vest!
But still pantless!