Yeah that's what I had heard too. Not intending to anyway, I like the teardrop on my Borso.
Now, real question.. Is there anything wrong with wearing a straw hat at night? I had heard some people say that straw hats are only for the day, and it's felt at night, regardless of season.
As with most things, you can wear what you want to wear. If it's warm out and you want to wear a straw hat, go ahead regardless of whether it's day or night. I do.