Hi! I'll give you some feedback on some of your questions to try to help you out a bit.
Armor- I have Wolfgang's armor and I really like it. The build went smoothly. I have a friend who has resin armor from Mynock's Den, and it is also great looking armor! (He's on the left, I'm on the right)
Mask- I troop in an early version of Mynock Den's mask with no backing. I also have a mask from Wolfgang but it was too big. (He has two sizes and I believe I ordered the small, so I was surprised by that.)
Neck Seal- I have a heavy (vinyl?) one from Wolfgang. I also have a light cloth one that I got from someone (?) on the 501st forum a long time ago, but I dont troop it.
Gloves- I use these FIrm Grip gloves I got from Home Depot.
Robe- haha- I can't sew, and I made my acolyte before folks started selling them, so my mom made my robe for me from a modified jedi robe design.
Belt pouches and belt- my belt is made of tan webbing and the pouches are nylon latex glove pouches. I wish they were a bit larger, but they work alright.
https://www.rothco.com/product/rothco-enhanced-heavy-duty-latex-glove-pouch
Boots- I use some tactical boots from Big 5 that come just above my ankle. I didn't want anything too high that I would have to squeeze into the shin armor. Response Gear Tactical Footwear- Deputy.