The reasons are simple:
1) Just in case you walk by a swanky bar, and don’t feel like rushing back to your hotel room to get rid of the old jeans and stinky runners…
2) As a tourist, actually, as anybody, we normally get better service and treatment when we dress up a little bit. Plus, don’t you think it’s a bit odd, when one wears singlet; shorts; backpack and thongs, then walk into an up-market boutique store…? Remember, a little effort gets us a long way!
3) Holiday romance does happen! ! ! After spending the whole afternoon strolling by La Seine together… You, are invited by this charming European prince to a posh French restaurant which over looking ‘La Tour Eiffel’!!
So, isn’t it lovely that you happen to look the part! ! ! 😉