Ok I have no idea on this one, tho with the bionic and armored chest plate as well as the hips and thighs. I thought its a good idea to dress my Blue Protogen Ciel Mirai in clothes. With those armors I think I consider him "naked" but I'm mean't to conceal them under clothes. So here's Ciel wearing a sample of his casual outfit that i'm sure that fits him and this is the only pic of Ciel Mirai I got and drawn him in clothes to model and showcase any outfit worn on him.

Outfit Description
Ciel is wearing only a dark blue hooded jacket thats zippered close with gray draw strings and silver metal aglets, his insignia or symbol is placed on his left pectoral and a larger one on the back, gray 3/4 capri jogger pants with the pocket patches colored in dark gray and lastly wears black foot warmers or toeless socks that exposes his toes and remain barefoot despite having Digigrade feet, no shoes that are compatible to be worn on this type.