This is probably a really stupid question. I've never questioned it before, but I ordered the VC Moto Leggings from NAS. The info says they run big and to order a size down. I ordered my regular size and a size down, and now I don't know which is better.

The larger size goes on without any effort, but it does have a little extra fabric in the crotch and it bags slightly at the knees. Not a lot - if they were regular pants, I would see the fit as totally normal. They are also a tad long and bunch slightly at the ankle, but that doesn't matter since they will be worn mostly with boots. The waist is high enough that they don't seem to fall down at all, and of course I would wear tops to cover the crotch anyway, so I don't know how important the fit there is.

The smaller size I need to pull on and then pull up some more on the legs; they are definitely more form-fitting. The waist is tighter and almost feels too small going over my hips, but feels fine at the waist once on. They don't bag behind the knee, but do have some gathering there (snug). The nature of the fabric is thick enough that they don't get sheer when I bend, so I cannot use that as a gauge.

Anyway, I am just looking for some pointers on how leggings/pants like this should fit. Should this particular style fit like leggings or like slim pants? Would it be better for them to be slightly tight or slightly loose? DD (13) thinks the larger pair looks better, but then again, she tries to wear everything too big. Her idea of jeans that fit are jeans that she doesn't need to unbutton to get on and off!