Plate armour
The sabatons need more plates, otherwise you canāt walk in these. The visor slits on the houndskull are to big. The cuirass could have more waist. The knees look a bit creepy, but I got no good picture right now. Iād leave them the way they are right now. The plate gauntlets are ok. The lower arms lack in shape, but no one will notice this. The holes for binding the spaulders onto the shoulders are missing.
Maille Shirt
The maille shirt looks good, could have a bit more waist.
Brigandine
The gauntlets are from the 1340s and already 60 years old. But Iād keep them in the game nevertheless as they make a good match with the rest of the splinted / brigandine armour. While the legs and arms are correct here the cuirass (the brigandine itself) is not correct. You can clearly see the plates as well as the rivets. On extant pieces one plate always overlaps multiple other plates to leave no gap. While on this piece, there are gaps between every small plate. This is nonsense, Iād just have to put a lance tip in there and the enemy is done for.
Gambeson
The gambeson is good.
Lamellar
I have no idea about cumans but the construction of the lamellar armour is correct. The shoulder scales could be a bit more narrow as to get more overlapping, but this is nitpicking.
These are the last 3 pieces
If the first one, the leather vest only counts as clothing I can live with that.
The second one is the nonsense I wish to see removed, just wtf is this supposed to be? O_o
The third one is quite fancy, and I 'm not sure if eastern armour was already developed to this point in 1403. But I 'm no expert when it comes to eastern armour, therefore I wonāt judge it.