I don't quite understand the question. Jeans in my opinion should always be for your correct inseam, unless they're unsanfordized, meaning that they'll shrink once you wash them (and preferably to your correct inseam). Some people like to get taper jeans a bit long, so they can bunch up at the ankles. Others like to purposefully get longer jeans so they can cuff the bottoms, which I am not a fan off at all. Flared jeans is just a style. They look good on certain body types, and I'm not too much of a fan of them, especially now that they've been so overdone. If my jeans aren't straight, they have to have the most subtle of bootcuts.