No, easy aircraft don't have a hanging closest.
You do see people bringing them on board though, but I imagine this will depend on on the ground staff dealing with the flight as official it wouldn't be allowed in accordance with the policy.
If you pack the suit well enough, putting socks / pants in the bits you need to folder and then hang it in a steamy bathroom when you arrive at destination it usually still looks good at the other end!
Hope that helps and have a great wedding.