What's Puma's link to the stock index? There isn't one. What do stripping models have to do with the finance markets? Not an awful lot. This however hasn't stopped the sportswear brand launching an iPhone app that sees models removing layers as the markets go down - "you lose your shirt, the models do too". "It's a bit of fun when we need it most", says Puma. Thanks for that, for a second there we thought it was a dumb publicity stunt.