It seems like the cost of insulation mostly depends on improvements in the insulation manufacturing process, which seems kind of different from innovation in clothing itself.
For example, if we stopped innovating in clothing design entirely, people might focus more on reducing the production costs of fixed amounts of materials, so insulation would get cheaper by your metric, and it’s unclear if that counts as innovation in clothing.
Going the other direction, if we invented a less insulating, expensive insulation with magical perfect durability, it would be a huge clothing innovation but the cost of insulation would go up by your metric.
It seems like the cost of insulation mostly depends on improvements in the insulation manufacturing process, which seems kind of different from innovation in clothing itself.
For example, if we stopped innovating in clothing design entirely, people might focus more on reducing the production costs of fixed amounts of materials, so insulation would get cheaper by your metric, and it’s unclear if that counts as innovation in clothing.
Going the other direction, if we invented a less insulating, expensive insulation with magical perfect durability, it would be a huge clothing innovation but the cost of insulation would go up by your metric.