If you like wearing a beret with your kilt here's a good source:

South Pacific Berets

Daan is a interesting guy (I've exchanged a couple of emails with him). He's a Danish novelist living in New Zealand. I've bought a couple of the berets he carries (VERY nice!) so if your looking for a quality beret you can feel confident with your purchase.

He's a beret aficionado and also has a beret blog that's a fun read:

The Beret Project

Sláinte.