Druid AC caps and shields

[Vexenu]

What's the current worn AC cap for Druids? Is it worth throwing in some higher AC items (i.e. Crystal Chitin Gauntlets with 20AC) to get near the cap when charming?

Also, does the shield AC bonus (i.e. going over the worn cap) apply to casters as well? Wondering if grabbing a Sarnak Battle Shield for charming would make a noticeable difference when taking hits.