I can't do it, but the advantages are that it doesn't get scratched/dinged or worst of all caught on machinery, protrusions, etc. I know some who wear all the time like this, but I have tried and I can't.



SOMETIMES, the practicality of it makes me WISH I could but I can't.



Obviously, in some diving environs this could be a boon; I used to "hang" with a SCUBA instructor that wore his inside.



I also have seen a few military folks do it probably for the same reasons (and maybe the tactical reasoning that it's less likely to give away their position???)



Funny...never heard of doing it just on vacation or in seedy parts of town... Must be a NY thang... :-d