Can we get an option to hide/stuff our tails?

[Felis]

Fantasia to Hyur

You had to remind me of the glorious graphics back then, hadn't you? T.T

On another part, look at this, I think, they should do it more often this way

It doesn't always work, however... This is the Noct Armour while standing in the base pose:

The other picture is a female Miqo'te. The problem in your picture is the tail of a male Miqo'te (it have a curve at the beginning, let it clip through the armor more at the side)
Solution: the devs should replace the male tail with a female tail (a straight line instead of curvy).