Here's some general notes i've been keeping on found components that have been confirmed so far (some have already been mentioned)
Some of these will definitely be level 2/3 parts
Gloves
Highlander Spec Ops Glove Mfg. #GL033-BK
Label on wrist strap removed if present - stitch holes visible on “Standee Trooper”
Sizing appears to run a size small - order a size larger than usual
Tunic:
Custom design (Crossman)
Crossman did not recall exact color fabric used
Cog patches both shoulders (Screen, Promos) One BTS shot seems to show the newer embossed vinyl style as used on the spaceport security uniforms.
Pants:
Custom design (Crossman)
Used braces/suspenders (Unnamed source, not verified elsewhere)
Snap hooks, D-Rings, and sliders for mask and helmet straps:
Yugoslavian/Serbian army surplus backpack (Crossman)
Mask attachment buckle:
Identified but appears to be rare single-supplier part, sourcing in progress
Cape, a.k.a. “Slick”
Called a “slick” by troopers (Solo Guide)
Russian Plash Palatka, with leather grommets, dyed black (Art of Solo)
Hero version had curved cut on bottom for better drape/appearance (Art of Solo)
Standard Plash can have bottom corner folded up using toggle so that it doesn’t drag on the ground. Some studio shots have the corner all the way down, but could be cumbersome while walking.
The stitching of the leather grommets varies - earlier examples have button-hole style eyelet stiching that wraps the inside edge of the eyelet, but later examples just have a circle stitch to simply affix the grommet
Some newer versions have brass grommets, but can be removed and replaced with a hand-sewn leather grommet to replicate the appearance of the older versions.
There is some waterproofing/wax treatment on the fabric, may need hot washes to remove, and may need 2x dye/wash cycles to darken sufficiently.
Ammo pouch
Yugo M56 ammo pouch, same as ST (Screen, Promos) Not used by all troopers
Some on-screen configs include oiler pouch in standard location above pouch. (Solo guide, Screen)
Officer goggles
Modified Russian pattern 1938 pilot goggles. (Screen, Promos)