Hey, thanks for checking the website out! For the investment banking firms, I just took firms from google and manually assembled the list and for the other lists, I did a mix of googling and pulling from established databases such as Capital IQ, Thomas one, etc.
This is essentially the model I wanted to start off with; Having the measurements and style of certain customer in a subscription business, gives you the luxury of continually learning a customer's taste and sizing creating a nice hedge to competitors and a healthier customer lifetime value.
Good points, I was thinking about starting initially with jeans, so I didn't spread myself thin. I would ideally want the product to be open to everyone, but perhaps charging a high premium and focusing on a small number of customers would be the best way to scale. I like the feature you suggested as well.
These are two problems I definitely saw coming. The trust element is a big one, and I've thought about doing what you suggested so as to avoid the logistics, but different jeans and clothing brands fit differently. I think if I have people send in clothes and perhaps have a spreadsheet of how brands fit, I would eventually have an heap of data where I wouldn't need people to send in clothes.