My friend (bf'ing her first baby) designed and made for herself a top that I really think she could market.
She made two long sleeved and two short sleeved versions of it.
It's basically a slightly fitted top with an inbuilt sling/pouch and drop down flaps for breastfeeding. Hard to explain, but I hope you can picture it.
She did it as she was sick of strapping him into the sling when she needed to do housewrork/ go shopping, and then having to take him out whenever he needed feeding. Also her sling got covered in reflux vomit, and took ages to dry.
If she can produce these n organic cotton at £20ish would you think it is worth it?