From other photos I've seen, it seems to be fairly similar to 19th century RN sailors uniform, so could be real. Could he have served for, say 3 years, before he became a waiter etc.? I mean, did he have the time? If he was born in 1853, what do the 1871 and 1881 censuses say about him? It's always possible that even if they both describe him as a waiter, he could have served a few years in between those two censuses, maybe as a naval steward.