You've already identified commerce as a required function and you have a commerce engine that allows a gamer to choose and buy a selection of T-shirts in different sizes and colors.

我们已经确定交易是必需的功能，而且已经有了一个交易引擎，玩家可以通过交易引擎选购不同尺码和颜色的t恤衫。

youdao

Threadless, the T-shirt e-commerce site and community of artists who design them, is looking at the storefront option as well.

FORBES: Will Amazon Get Physical?

The difference, says Idealab Chair Bill Gross, is that eWallet doesn't depend on mutual e-commerce pacts among Web merchants to work.

CNN: Don't forget your eWallet when you shop online

Hard numbers are hard to come by because the company doesn't break out its e-commerce business, but the site is in the top ten in terms of visitors to e-tail sites, and its catalog is always expanding.

FORBES: The Overachievers: Wal-Mart Stocks Up