I wanted nice quality (now a days,
most mid weight sweaters are too thin and don't hold a shape) sweater to layer on and off at the office that I can get a least a couple seasons of routine wear and still look well groomed.
If you are going to isolate your Abs when working out then you should exercise the Abs last, this is because
most of the movements you do when working out, especially with free
weights will involve you using your core, which are all the muscles around your
mid section including your lower back and includes all the Abs (upper, lower and internal and external obliques), to keep you stable.