I like to think that Twilight and Legend just... carry crap in their mouths
They don't really think about it. In their beast forms, it's the only way they can actually move things on their own, and it works! So, even though as hylians they still have hands, there are times when they don't have enough hands so they just... put whatever item they don't need as much in their mouth. It's not just things like clothes or items though.
One time Twilight just straight up bit down on his sword hilt so he could use his hands for something else, and Warriors had to witness Twilight supporting the weight of a whole ass sword with just his teeth and not even struggling that much.
They also put dubious items in their mouths sometimes, and even Wild sometimes has to wonder why.
To them, this is natural, this is normal (it is their normal) and they sometimes forget that they can actually use their hands to hold shit sometimes. Like, when they're in a hurry, Legend just grabs something in his teeth and darts off, because running takes all your limbs sometimes, and he's forgetting he only needs two for that right now.
Most of the gang have no clue what this is, and despite calling the two on it, they don't stop. Sky is the only one who doesn't think it's all that crazy, because it does sort of make sense, knowing what he does.
