What do you think of this, Elin? Considering Chun-Li's experience against Juri Han (Super Street Fighter IV) which forced Chun-Li to train harder to gain more powerful and faster legs in order to fight supernatural beings, it seems that Chun-Li will not be able to wear pants never again. Just look at her thighs in Street Fighter III: 3rd Strike!!! I think that her legs reached their maximum power, but she had to sacrifice other clothes to get dressed in a more comfortable way and to feel useful and free in the battlefield.
I can conclude that any pants won't exist in the wardrobe from an old-fashioned female warrior like Chun-Li.