Welcome to the MSG 501st forum. Glad you have found a costume that you'd like to put together. Sounds like there will be a few new TIE Pilots in the Knoxville area. There are lots of people that can provide advise on where to get and not to get things.
If you haven't picked a specific version of the TIE pilot, here is the CRL for the basic Pilot specs: http://databank.501st.com/databank/Costuming:TI_TIE_Pilot_ANH
You might also want to consider starting with the TIE Reserve Pilot costume since you can use it until you get your full pilot done... and it happens to be a lot of what you'd already need for the pilot anyway in terms of boot, belt, and suit: http://databank.501st.com/databank/Costuming:TI_reserve_pilot