I don't know if anyone has noticed, but if you move your mouse just a tiny bit too much on the inventory screen, trying to put on an item, the item doesn't get put on. Like, at all.

That's fine if I'm feeling fine that day, but... um...

I have fibromyalgia. My hands shake. A lot. I don't really wanna get into that, since this isn't the place for it.

It's just... dressing my avatar isn't very chronic illness friendly, since you have to hold the mouse completely still. Even on my best days, I sometimes have trouble putting on items.

Is there a way to fix this? I use chrome.

I believe that's a Chrome specific issue, so you might try switching browsers? Sometimes just clicking a lot will eventually put the item on as well, but I'm not sure how well that would work with your illness. :(

Hammy's right that Chrome is a wee bit temperamental (slight euphemism there) when it comes to your inventory. Is it possible for you to switch to Firefox? Even if it's just for changing your avatar.

I can install firefox for changing my avatar, then. Thank you

I use Chrome as well, and have noticed, that you have to click on the item itself to equip, not just the box.
So, changing browsers would work for you.