I wonder if there were any brands or items that were outliers in the cost to value metric? I prefer to buy nicer things that last a long time, but clothing is an area where cost is only loosely coupled with quality. Spending more doesn’t always get you more.

Not backed by data but I'd recommend Uniqlo and Patagonia. Engelbert Strauss (workwear) is also worth looking into if you're in the EU, some of their clothing can be worn casually and offer amazing value for money.