Pajama jeans are the best!  These are just like the cords and jeans offered by this company.  I wear the size 4-6 and weigh 147.  The waist band does not open, zip or button.  They are pulled up and over your body like a pair of swets but they are not stretch in the waist band.  The pants themselves do have a stretch to make them comfortable to sit and bend in.  They do not get saggy as the day goes on and wash just great in the laundry machine.  I highly recommend them.