dr.schliemann: If you are using the standard keyboard setup for the game, I think that putting your mouse pointer over the gear you want to equip and pressing "Enter" key should be enough.
Check this video too.

Yubblezz: Hello,
I played gothic3 1 or 2 days ago, until a problem occured...
I was at Okara and bought my first armor, but i couldnt equipd it.
I tried to replace the Mousebutton to with like every free button i had on my Mouse/ Keyboard, but still wasnt able to equip it.( If i click with right mouseclick on the armor nothing happens)
Same with my Bracellete(?) and stuff.
I reinstalled it, tried alternative balancing and without, but it didnt help.

So anyone knows how to fix it?

I use GoG and patched the latest community patch on it (1.75.14)
Also tried it without the community patch

I Have windows 10

Guess thats all that could influence it.

Hope you can help me :)