This MWSE mod implements level requirements to equip all of Morrowind's clothing items. It's basically Remiros' Equipment Requirements for clothing; in fact, it's really just a modification of Remiros' code, adapted to clothing rather than armor and weapons.
Since there's no skill associated with clothing, the criterion used for the requirements is the player's level. Requirements range from level 1 (for unenchanted common clothing and low-end enchanted stuff) to level 60 (for the Royal Signet Ring).
For unenchanted clothes, level requirements are level 1 for common, 3 for expensive, 5 for extravagant and 10 for exquisite. For enchanted clothing, requirements vary based on the usefulness of the enchantment (mostly ranging from level 1 to in the 20s, but a few exceptional items are higher). The archive contains a spreadsheet listing all clothing items in the game, their enchantments, and their level requirements.
Like in Equipment Requirements, clothing items without a requirement specified in the code (i.e. clothing added by mods not specifically accounted for in this mod) will have a requirement determined by a formula. The formula takes into account the item's value and enchant capacity, but not any enchantment on the item. However, all vanilla clothing items have specified requirements, as do items added by certain mods.
Unlike in Equipment Requirements, there is no alternate mode with penalties if you equip an item you don't meet the requirement for. If you're not high enough level, you just can't equip the item.
The archive also contains an optional modified version of Remiros' Equipment Requirements, my personal edit of that mod that addresses a few issues with it. A few typos in item IDs have been fixed and missing items added. Additionally, a few balance adjustments have been made, and the lowest-tier stuff is generally equippable by anyone. Also, arrows and bolts now have requirements as well, and a few other changes have been made; see the changelog for a list of additional changes/fixes.
This mod requires MGE XE and the latest version of MWSE 2.1. Just install MGE XE and run MWSE-Update.exe to download the latest build.
I recommend using Consistent Enchanting with this mod. If you're using Consistent Enchanting (and have it configured to carry over enchanted items' base items), the requirements for player-created enchanted items will be 5 higher than the requirement for the base item. (You actually need to have been using Consistent Enchanting at the time the item was created.) This applies to both Clothing Requirements and Equipment Requirements.
If you're not using Consistent Enchanting, requirements for player-created enchanted items will be determined by formula, with possibly inconsistent results.