I started with getting the armor first. Then flight suit and vest. Then the cummerbund. Then boots and gloves.
So basically I started with the parts that didn't need much for measurements.(armor) I figured that when you start on soft parts its best to start with your flight suit first and layer up each part when ya come to it measurement reasons and proper fitting and armor placement.
Now I'm 90% done with mine and at the hardest part witch is finding the right helmet maker to complete my bikerscout suit.