Big Bug Changes Clothes

Yesterday morning when I went outside, I saw this big bug walking along the deck railing. This guy was about and inch and a half long. He didn't seem threatening so I let him just wander along. Interesting When I got home from work, the bug was gone but he had left his old suit of clothes behind. This is the first time I have seen an old bug suit on the deck, usually I see these old suits on tree trunks.