Thank you,. Foxe, it was more than enough. :)
Of course, when somebody describes a sailor who wears boots (in the books where I had read it or in my games - because I asked about it now and not before, simply because I was curious when I read it on various sites that it is not recommendable, but I forgot to ask until I saw a new sailor described as wearing boots in an application on my game) they are not described what kind of boots.
There is evidence of boots being worn by seafarers. For example, a calf-length boot was recovered from the wreck of the Vasa (1620s, so a bit early), and an ankle-length laced boot was recovered from the wreck of HMS Stirling Castle (1703), and there is evidence of fishermen wearing long boots.
Well, somehow I knew too that sailors wore boots. And this was exactly why I was wondering why several sites said "no boots, but shoes" - which, in my opinion, were for richer, more elegant people. (When I said "boots", I didn't think about Jack Sparrow's, but something simpler and cheaper).