Larian Studios Forums Baldur's Gate III Baldur's Gate III - Build Discussion Basic Armor

Let's look at Barbarian.

Potentially, AC 20 with Dex 20 and Con 20.

You might get con 20 from the Barbarian garb that boosts AC and a natural of 18. But you just don't have the points for dex 20. So you're stuck with dex 18 with gloves of dex. And there's only one of those. That's AC 19.

Also AC 19: Half plate+2 and dex 14. The same dex 14 your cleric and druid probably have.