I've got a bit carried away buying handmade baby clothes off Etsy they have an app as well as a website. It's a place to buy and sell hand made or vintage items around the world and have some brilliant baby clothes. I'm currently having a couple of baby hats knitted by a lady in California. You pay everyone by PayPal.
My tip - buy something for 0-3 months or larger, not newborn. For the first few weeks your friend is unlikely to have the energy to put the baby in anything other than an easy to wash babygro. I have a drawer full of unworn new born outfits, all gifts. It such a waste.