Unusual behaviour? Do your ducks do this?

[Finny]

My two Indian Runners, Wayan and Ketut are very affectionate. We always cuddle up and they nibble and preen me.

However over the last couple of days, I've noticed when I'm not sitting with them, they find an item of my clothing and sit on it.
First it was my sarongs, then my shirt, then my hat and last night sitting on top of my thongs ( flip flops, Aussies call them thongs). I can't imagine a pair of rubber sandals being that comfortable....

My duckling does this too! Its adorable!