Living in Brum, our local ITV news is Central, and they have just had a feature on football kit prices.
It gave a breakdown of costs of a shirt costing £80

£26.40 Retailer
£23.47 Manufacturer
£13.33 VAT
£8.00 Cost to make
£4.80 Football club
£4.00 UK distribution + marketing

I'd expected that a club would have only made a small fraction of the overall sale but you'd like to think it should have been higher.