A key part about a puzzle is that everything you need to solve it needs to be presented from the start. The challenge to the player is figuring out how to put the pieces together. In this case, the information that the man was in a sailor’s outfit is unknown and not something someone should be reasonably able to deduce from the given information. Literally nothing in the setup telegraphs that the man is in a sailor’s outfit. It’s like someone gave us a jigsaw puzzle that was missing pieces and then were shocked that we couldn’t solve it.