Another option is to have a made-to-measure / custom polo shirt made. I was recently
in London as saw some lovely examples in the Archer Adams shop in Marylebone.
What was really interesting was that there were a lot of collar options for the polo (along
with loads of colors). In other words, a polo with a proper shirt style collar looks much
better under a jacket than the usual floppy ones on most brands. You can also choose
many different pocket options, button...