Short answer yes. Within reason.
The armor doesn't really HAVE a set appearance, so your armor can look like almost anything. You could have a personal sub that looks like a yellow submarine, a rubber ducky, a mechanical frog, a blue whale etc. That's whether you build your own or get it off the rack. It couldn't look like a business suit, innocuous scubba gear, or an innocent space manatee.
There just has to be something about it that someone with engineering can look at it and tell what it is. (Possibly at a penalty cause its rare/unique/homebuilt) and that the general public will notice is a suit of power armor.