Misaki and her skirt

it's still been a mystery to me why misaki doesn't fold her skirts?... in general, why the creators doesn't do generic mini skirt japanese uniforms.. in anime that is.... because actually in real life the true length of girl skirts in japanese uniforms is the same with what misaki wears, its just a common trend for high schoolers to fold their skirts... but, it just looks sad...

I think it's somewhat a reflection of her serious nature.

3XXXDDD is right. If you look at other anime series that have girls not folding their skirts, they are either have a serious personality, a authoritative personality or a delinquent personality or all of the above. They also are also usually in a position of authority.

Misaki is definitely serious and somewhat bossy as well. Naoki calls her boss-lady as well. She is also a senpai to the rest of the Cardfight Club so she is in a position of authority.

According to the manga, Misaki does that to hide her legs to kick people.