Nancy the Maid.

Illusion can be cast two ways, you either channel power continuously into it or cast it with a set amount of power that will run out. The direct feed manner is dangerous as any distraction might let you loose your focus and make the illusion dissipate, not the ideal when the illusion is all that you are wearing. The other one is better except in one event, a dispell will rob you of all the power invested into your spell.

After years of practice in various illusions and clothes in particular you had learned all the tricks about it. It wasn't enough that it looked like a dress, it had to feel like a dress if someone brushed against it, follow your body or move around like a dress, even sound like a dress when it moved. Your talent and your ignorance that it would soon become your only way of being clothed had pushed you to cast the best you could, hoping in the same way to impress your new mistress with your talent.

Now it had left your mana reserves very low, especially if you were expected to keep some illusory clothes at all times.

You couldn't be caught naked by whoever was entering but getting fully clothed would assure you to end naked well before bedtime. You elected quickly to give yourself the appearance of wearing just underwear.

It was far from what you had in mind and you suspected your mistress from tampering with you powers but at least you were somewhat covered when a young girl in an even more scandalous outfit entered the room.

A nice girl with big boobs and long pink hair was barging in. She wore a maid outfit and despite the lack of elven heritage had her breasts on display, her skirt was even too short to hide anything down there. Stranger was that translucent magic field that covered her nappies and her pussy, why go all the way to cast a spell like that if it doesn't hide anything.

"Valeria this is Nancy my maid. Nancy, Valeria is forbidden to wear any real clothes in the tower, if you catch her wearing anything else than an illusion you can spank her. " said your mistress.

"Of course Lady Formosa, as you order. How about outside? I have to go pick your shipment of Amber in Little Mountain, an eye for magic could be useful." asked the Maid.

Little Mountain was the nickname of a Dwarven neighborhood in Kelredia. The Amber this golden crystal of unknown origin was sometimes found by miners that went deep into the earth, it was a very powerful magical component. It was of varying quality and good looking crystal could be less powerful than raw looking ones.

"Just give her one cloak for the trip there and let her borrow a piece of Amber for the trip back. " decided lady Formosa.

It would be tricky. You would have to focus your powers on parts that the cloak exposed, or risk passing as some slut that was walking out in nothing but a cloak.