Implementation of a "Tail Toggle"

[Nyalia]

That's not my argument. Physically it would be possible, however Miqo'te are cat-like people. That tail is an extension of their spine and is essential for their balance. They'd be extremely uncomfortable (and noticeably more clumsy) if they stuffed their tail down a leg or something.
Try sticking your spine down the leg of your jeans later on and tell me how you like it :')

... are you suggesting that chocobo costumes are supposed to be comfortable? Err, have you ever worn one of those fully body mascot suits? I don't think comfort is a pre-requisite here XD