Summary:
The square orange aura that appears under the player from the armor (Fox armor, Black wolf armor...) is visible in the trade window of the merchants. Aura of another type will not be visible in the window when trading.

Steps to reproduce:

1. Equip armor such as Titan's shroud, Fox armor, Black wolf armor, Cave crawler (or other with a yellow square aura).
2. Get close to any merchant on the spawn.
3. Open a trade window with a merchant.

Observed results:
The orange square aura from the armor is visible in the trade window.

Expected results:
As with other types of aura, the square orange aura from the armor will be invisible in the trade.

Image: