My reason for this is that if you look at the other art of Sticks, you'll notice that she's wearing a leafy thong. Since there wasn't a leaf bikini so I had it made it commissioned one. You'll see the difference of the pose like the one Sally Acorn did.
The Leaf Bikini looked as dam hot! Also did you know that Love Hina Spring Movie that Naru and Nyamo wore Leaf Bikinis that made them look like Jungle Girls. I love that anime because of it.