Thank you Graham - I had a great time touring round the St Malo area of Brittany - St Malo itself, Dinan, Dinard etc and along the northern coast, plus some visits into Normandy - Mont St Michel, Dol, Saint Mere Eglise (featured in the film "The Longest Day") and Carantac (of "Band Of Brothers" fame).

However, to go back to your original question it is the weight and not the quality of the wool that decides warmth - basically the heavier (thicker) the warmer although perversely a lightweight (10/11oz) can be warm on a cold winter's day provided there's little or no penetrating (or upward) wind, which is the real deciding factor. The quality of the wool is reflected in the quality of the kilt - the better the wool (and the quality of the weaver and the skill of the kiltmaker) the better the kilt in terms of appearance, longevity etc.