I can only speak for myself, but I just signed up, so I guess I'm part of their market.

I consider myself (or at least, aspire to be) decently fashionable, but I have a lot of anxiety about actually clothes purchasing. The whole subscription + curation model means a) clothes appear without me having to actually make the (for me, very fraught) decision and b) when I think that an item of clothing looks good, I have some corroboration on that from someone who does this for a living.