In reply to Rachel Slater: It used to be the reverse - British climbers, regardless of their income, used to wear their oldest, tattiest, holiest clothes. Trousers which were too far gone for gardening in would be worn for climbing. Tramps looked at us pityingly. To the continentals, and particularly the French in their neat jumpers, matchings stockings and pristine white caps, we were beneath contempt.
It was part of the 'look', which included the unkempt beard, woollen breeches, red socks, helmet and peg hammer. If you'd been to the Alps you were allowed to wear a duvet jacket patched with elastoplast, but only in the pub.
The problem was, most of this stuff wasn't very good. When you got wet (and you did, because the waterproofs weren't effective) you stayed wet. We would huddle round the fire in the evenings with clouds of steam coming off our clothes. On the whole, modern gear is more comfortable and more effective.