I bought the Deluxe Revan from My Wicked Armor. I wanted the back armor as described in "optional accessories" in the costume standard. The commissioned armor pieces have straps attached on the front and back armor that are designed to tie together over the shoulders. I added Dritz 3/4" parachute buckles with contour shape to the straps to hold my armor adjustment and to make dressing easier.
http://www.mywickedarmor.com/
After determining my placement, I pinned the straps in place. I placed two clothing clips on the straps to hold them and then placed two more to mark approximately where I wanted to connect the buckles so that they would be hidden from view. The two higher clips sit where I wanted the buckles to connect. (Note-shirt in photos is not my costume shirt.)
With the armor not secured at the sides, I lifted the armor off, keeping the clips in place. I then determined the length I needed for the straps, considering the added 2" length of the buckles. I ended up increasing the front length to 7" instead of 5" of strap length.
I kept the back lengths at 2".
Before sewing, I made sure the contour of the buckles faced the correct way. I put in some stitches by hand to keep the buckles in place, then used the sewing machine. I won't need to pull the fabric of the straps through to make adjustments since I measured where I want them. I can now easily clip the buckles to hold the armor together and slip both front and back armor pieces on over my head.