If I roll a Mountain Dwarf Wizard, can he wear medium armor since they are racially proficient, even though he's a wizard? @JeremyECrawford

— TheDubiousGentlemen (@Dubious_Gents) December 12, 2016

You can cast spells in armor, as long as you're proficient with the armor you're wearing (see "Casting in Armor," PH, 201). #DnD https://t.co/aWAkauk5xo

— Jeremy Crawford (@JeremyECrawford) December 13, 2016