The giant squid in armour. Now that's a truly inspired thought. I suppose it would have to have a Never Rust enchantment on.

And I think the benefit of Slytherin's serpentine mail was that it did not require one to move like a toy soldier with pins for his joints. But I take your point. It might be best suited for someone who needed a full and fluid range of movement. Perhaps Slytherin was aiming to outfit an army of Veela.

The next chapter may be quite an interesting one!