I have experience working at Target where we had thousands of different SKUs for the shoes and clothing department, and also handled online orders.

In my experience the best platform for integrating physical retail inventory into an e-commerce platform is using Stitch Labs. Once you set up your initial account, Stitch brings all of your inventory together by integrating with your shopping carts, marketplaces, POS, payment processors and accounting solutions.

This means that when you sell an item of clothing in a physical retail shop or any online platform including Amazon, Amazon FBA, Etsy, eBay, Shopify, etc. your master list of inventory is adjusted accordingly. They also integrate with Xero to push orders through and make accounting a breeze.

If you would like to discuss inventory control or multi-channel e-commerce further, please reach out.

Thanks,
Reed