In reply to ti_pin_man: > isn't that what eBay is for?
Would you really prefer your customers to buy from the open market on ebay and compare your products and prices to the alternatives there? If plan to compete solely on price and features for a new product you're on to a loser unless you can leverage an existing low cost manufacturing and marketing infrastructure.
On the other hand if you're aiming for higher margins you'll need a) deep pockets to subsidise you until you've built your reputation and b) a way to differentiate yourself from cheap 'n cheerful "disposable" clothes.
This is assuming that you actually want to make any money at it.
Presumably you've seen Patagonia's common threads program? Maybe if you could own a slice of the secondhand market you get to build your brand and loyalty from thankful parents who don't have to shell out for brand new stuff everytime junior has a growth spurt.
George Fisher also do a junior boot exchange based on the same idea - kids grow out of expensive stuff. If you can take some of that risk out for parents, they'll come back to you - vs buying cheap crap that will end up in landfill when it's outgrwon.
Just a thought...