Here is the list of mods that introduce vests, and the vests are converted to armor upgrade modules with this mod.

1. Base game vests - All 4 vests are converted to upgrade modules. Nanoscale vest gets additional ability if you have Iridar's Plating Overhaul
   
2. Flame Viper - 1 vest converted
   
3. Pathfinder - 1 vest converted
   
4. Bio Division - 3 vests converted
   
5. MTF Raider Faction - All 4 vests have been converted. Loot tables and PG techs (and its costs) adjusted
   
6. Bitterfrost Protocol - 1 vest converted
   
7. Mitzruti's Additional Vest Types - All 10 vests converted
   
8. Claus's Assault Trooper - 2 vests converted
   
9. Valentines Viper - 1 vest converted
   
10. Advent Psi Ops - 1 vest converted
    
11. Muton Destroyer - 1 vest converted
    
12. LW2 Platings - Ceramic Plating given as ability to all armors by default (you will only get +2 Shield HP when armor upgrade slots are not used). The 3 higher tiers platings are converted to vests.
    
13. CreativeXenos Archons - 1 vest converted
    
14. Metal Over Flesh Redux - 2 "vest"s converted
    
15. [WOTC] Corrupt Avatar - 1 vest converted
    
16. Better Alien Ruler Rewards - 1 vest converted
    
17. WotC Microstim Implants - 1 vest converted

The following mods introduce "vest" but were intentionally left as-is because it would not work as armor upgrades

1. Children of the King 2.0 - Frost Scale Vest. Reason: It uses X2GrenadeTemplate