Where can I purchase BLACK socks for my 1 year old? ?

Ok my son is turning 1 and I have a really cute Dickies outfit that I want to catch a photo of him in only thing is IDK where to get long-ish black socks for someone his size. They're like knee hight type but its not up to the knee just mid length I know men have those kinds of socks but does anyone know where I can get some for my toddler?