Referring to screen from Famitsu that opened this Can of Worms known as "Physical Level", lol.
From what I can tell we got Primary Arm, Secondary Arm, Large Pouch, Small Pouch, Head, Body, Undershirt, Hands, Waist, Legs, and Undergarment.
Now looking at pic I can also see the box that shows for Legs is hidden underneath blue box that wasn't translated, but has same symbol for Hand-to-Hand to the left where Rank is at. But to assume if hidden under that box we are definitely missing Feet and possibly other can be Back (doubt there be Undersocks but never kno ><). Also with this seems there are no Ring or Earring slots unless Rings go into Hand or Earring into Head, but no idea. Here's some thought what some of these slots might serve:
Primary Arm - Main weapon, determines Class.
Secondary Arm - Could be a number of things from Shield, Dual Wield, or Side-arm for small ranged attack.
Large Pouch - Maybe inventory? Or perhaps if Archer this is where arrows are stored.
Small Pouch - Same as Large but Small, lol. If Side-arm available maybe bullets or bolts. Potions and Ethers.
Head - Obviously helmets, hairpins, ribbins, and maybe also earrings.
Body - Breastplates, jerkins, doublets, and stuff of the sort.
Hands - Gauntlets, bracelets, gloves, and possible rings.
Legs - Leggings, Hose, Slacks, and so on.
Feet - Boots and the sort.
Back - Capes and mantles.
Underwear - Undershirt and Undergarments I doubt they'll be removable or we'd see those running around Bare! I'm sure we can replace them with others tho.
Most of these are self explanatory, I think main mystery gonna be how Primary/Secondary Arms will play, and what Pouches are for. And tho Feet and Back aren't literally confirmed, I'm hoping they exist under that blue pop-up.