Get to the Tactictal Suit Button, there you can change it. In Beta 14 fully it worked, will test it shortly, have to produce the Accelerated Weapons finish first.
Yep you are right, you can produce it, but dosen´t change it on the Tactical Suit Button. The Undersuit works fully normal.
You have forgotten to attach the Savegame. I did it for us now, so the Devs can check what´s wrong.
user_warden_combat_armor_not_suitable-23.json