I always wear flashes, plain or tartan (matching the kilt of course) when the hose are "up".

I think flashes look very nice...even when dressed casual.
I'm not a big fan of the stiff type...they don't move and look unnatural.

I'm very fond of the "double" Lochcarron flashes....nice colours and they move when I move or because of the wind.

The House of Edgar has a huge range also...including some beautiful muted colours. Shockingly expensive though