Vintage Liquid Blue GRATEFUL DEAD Bertha Size XXL in Brown

Full disclosure I have no idea if this is actually vintage. why is there a liquid blue tag over a comfort colors tag? Again I do not know. I picked this thing up in a thrift store a long time ago and I decided to sell it. is there some crazy liquid Blue comfort colors collab that I've never seen before I don't know... everything being said it's in really great condition!