Hi there

I would have look on those 

http://www.vanishingpoint.biz/freestuff.asp?ClassificationID=25

http://www.ontarget3d.com/site/Products/133-us-paratrooper-wwii-gear-for-poser.aspx

Although they're for older M3 or Poser figures,but you should be able convert them for M4 via Crossdresser and other apps,not sure if Poser Fitting room will be able to do this

Thanks,Jura