Headless, you could always just set up more specified equipment in the military screen.
E.g. create a uniform for your squad named "Steel". Here is the one I use for my heavies currently:
- exact matches + replace clothing + wear uniform when off duty
- head -> helmet; material -> steel
- head -> hood; material -> leather
- armor -> breastplate; material -> steel
- armor -> mailshirt; material -> steel
- armor -> robe; material -> leather
- legs -> greaves; material -> steel
- legs -> trousers; material -> leather
- hands -> gauntlets; material -> steel
- hands -> mittens; material -> leather
- feet -> highboots; material -> steel
Your dwarves can wear a maximum of 3 items on their legs and body. (trousers + trousers + armored leg; robe/shirt/etc. + robe/shirt/etc. + armored body)
A maximum of 2 items on their hands and feet. (gloves/mittens + armored hand; socks + armored foot)
A maximum of (I think) 3 items on their head. (underveil + overhood + armored head)
You can check the clothing types
here.
Anything that has an "S" tag or is layertype "armor" is considered "armored". You can only have 1 of these at a given time per body-part and group some under- and overclothing around it according to the above maximum numbers.
(So they cannot wear gloves as underlayer, greaves as armor and mittens as overlayer because only 2 items fit on the hand. If you do assign all 3 items you will see some of them wearing leather gloves + leather mittens but not wearing the gauntlets.)
Using this method, they are still flexible enough to switch out their -steel breastplate- for a *steel breastplate* when your armorer forges it but they are always keen on finally completing the set you have assigned to them essentially forcing them to wear steel and leather only. As soon as something better is available (in terms of quality-tag) or something is available that was missing (typically leather clothing because the civilians also wear them) they will go and snatch it.
The only thing you really need to obide is having enough of each steel-item when you first assign the uniform. Otherwise they might end up partly naked or only in leather for a while.