Quote - One of the biggest problem areas in male figures are their pecks. Most of them remain stationary regardless of how the arms and shoulders are positioned. This isn't natural and always looks really bad. 

The inner two thirds of the pectoralis (relative to the ribcage), donlt move up and down very much because they are attached to the bone. If the guy is really plump they will hang down a tad, but seldom lower then the attachement to the bone. Only the outter 1/3 of the pectoralis is not attached (because there is pectoralis minor under that portion), and will be free floating... which is when pecs are big and relaxes they tend to droop a bit to the outside, instead of the whole slab of them drooping straight down. The nipples will float a little as the skin pulls them around, mostly in a bit of a diagonal motion. Most of the upward motion happens when the arms are lifter up over the shoulder and over the head, because a good part of the pec is attached to the clavicle. The part of the pectoralis attached to the humerus, in the first 90° of abdusction from supine anatomical position to the T pose will pull more outwards then up. After that, things get uplled up more.

If you really get into detail fo that you may need to make use of Poser's new cascading JCM's or ERC'd 'jiggle bones'... which would benefit a naked rig, but will make most clothing makers want to snuff you in your sleep. You'll have to decide how specialized you want to get. I don't remember if you are trying to make this work in Poser only or Poser or DS. For example, DS doesn't have non linear and cascading JCM's yet.

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Hi, my name is "No, Bad Kitteh, NOO", what's yours?