I was toying around with illagers when I found many weird glitches. If you put a helmet on a pillager, vindicator, or evoker, their head pokes through the top, due to it being taller than most heads. If you put a chestplate, legging, or boots on a pillager, they float underground beneath them instead of going on them. Shields also stick to the side of vindicators and pillagers heads. To replicate, put down a dispenser with a pressure plate in front. Place a shield, chestplate, helmet, boots, or leggings of any type in the dispenser, and then spawn a pillager on the pressure plate. This will allow them to wear the glitchy armor. My minecraft username is Marka78.