ChickenShack album cover?

[goldustsongbird]

I was discussing Chicken Shack with my dad earlier (the only one in my family who pretends to listen to my Christine/Mac ramblings), and he mentioned one of their record covers.... Something about them being all in medieval outfits? That doesn't even sound familiar to me, and I've never seen anything like it online. Not even on a single. Is he mixing it up with something else, or is it something of a rarity that actually exists?