2017-03-03, 12:29 PM (ISO 8601)
Re: Land Druid and it's AC problems
Page 65, PHB:
Originally Posted by Socratov
"P r o f ic ie n c ie s
Armor: Light armor, medium armor, shields (druids will
not wear armor or use shields made o f metal)"
If by explicitly not allowed you mean there are no penalties, sure. But your DM allowing you to do that is house rules.