This is not something we're going to tackle in the near term as it doesn't fit our core competencies. Selling products like "club sweatshirts" can be done with Curling I/O, but with limited feature sets. To manage store like products at high inventory levels you're better of using one of the hundreds of tools purpose built for it (Shopify, BigCommerce, etc.) which will allow more complex inventory management and variations (colors / sizes / styles, etc.).