Money isn't worth much because it's so valuable, but because we all agree that it has the value.
1 dollar and 100 dollar bill can be made for the same money, but be worth different values if we agree to it. We make some steps to ensure that you can't make other 100 dollar bill easily, as well as keep the production of our bills as similar as we can, so we can spot the frauds, but this shouldn't be issue for you.
You said that you can carry some items of clothing. Great! We have two options in here:
- Create a brand of clothing that is created by the government or something similar, controlled, and somehow protected(golden thread, some strange or hard to reproduce pattern). When you go into the high temperature environment, you just take few pairs of your valuable (hopefully sexy) underwear.
- If your magic allows you to do so, you may want to ensure that some of the finest magicians are hired by the government to imbue the underwear with the spell, instead of physical protection. This way, not so gifted magicians can't make currency on their own, since they don't possess the power to recreate the spell(or don't know its incantation, hand gestures, lack virgin blood or other vital ingredients, whatever).
You could also use 2. to add a plot, where some Dark Mage with sufficient power floods the market with Valuable Sexy Underwear that is also imbued with the same spell, and the market goes wild. I remember from history lessons that some country(Germany?) had inflation so high, that, for example, you could buy bread at the morning for 10000 coins, but at the end of the day it was already worth few times as much - you never knew what awaits you.