Also, you've saved me from future confusion. I thought Molten Armor was going to be actually strong against heat - because it was made of a material that can withstand lava - but now that I think about it, it does would make a LOT of sense to make it strong VS cold instead. Out of curiosity, are you planning to add tooltips as to what given items protects against in item descriptions (not sure what it's called, but... the info that shows up about an item when you put the cursor over it in the inventory) at some point later?
Actually, this should already be a feature. Every change (to items at least) should be shown on the tooltip. If it's not, then that's obviously a bug, lol. You should take a look at some of the armors & such, they should be showing exactly what kind of stats are being changed.
Also to answer that question about clothing; if you mean vanity, only some of those have a change. But if by clothing you mean armor, then again, it depends on the armor. Explicitly taking off your armor specifically won't help against the heat unless that armor set has a negative effect that makes you more vulnerable to the heat.
Thanks for the happy wishes though, I glad you are really enjoying it