The Pants of the Naaru changed with the patch to a more filled-in appearance.
Three other things that share assets with those pants are also affected; The “Snowy Owl” Contender’s Costume, Spiritshroud Leggings and High Priestess Boots.
Looks to me like the game got confused about what happens from the thigh down on those pieces and filled in with visuals from the male appearance, in the case of the Pants of the Naaru and the “Snowy Owl” Costume, instead of leaving the skin showing for females.
On the Spiritshroud Leggings and the High Priestess Boots, it took away the material from the thigh down and left them bare.
Some before and after pics can be found in this thread: