Dear All,
  I recently purchased a PF suit but when originally measuring myself forgot to do so over the top of body armour which as I found out makes a substantial difference to the fit of the suit.  I contacted RP of PF who immediately offered to exchange it for a "Large" suit which I'm now waiting to receive.
  In summary: I can't comment on flying the suit but when measuring yourself do consider all under garments and especially armour.   Secondly, due to my negligence I needed exceptional after sales service and RP provided it. Regards
  John (Kenya, East Africa)