Hahahahahaha welcome to the hell women with big thighs have lived through for decades! There's something to be said for skirts when the weather allows it, except then you have to take measures to prevent chafing.
In all seriousness, we haven't really figured out how to fix this in formal pants, though there's a shop that'll fix the blown-out thighs on your jeans:
Denim Repair - Denim Doctor - Repair Jeans - Denim Therapy NYC
As for that article, again, welcome to women's hell -- I couldn't even get especially outraged, because it just sounds like every single women's fitness article I've ever read. (Which is not to say I'm not mad -- it's just that I'm basically this mad all the time.) That poor woman setting up to deadlift with a fully rounded back and her ribs sticking out is a new one, though.
Notice that they've put in a disclaimer about not doing this diet/routine for more than two months at the outside -- which means they know damn well this is unhealthy and unsustainable, but God fucking forbid women have big thighs!