Afaik the market for second hand women's clothing is big in Japan on Mercari (the only startup there with a >$1B valuation iirc). Maybe that's a viable additional growth channel for her to reach an audience that's not finding the web store front.
The downside I think is that users on said app are conditioned to expect pretty steep discounts.
Thanks for the tip. I asked my wife and she said that Mercari doesn't allow sellers outside Japan (or at least didn't use to).
According to my wife, this seems to be quite common for platforms to insist on sellers operating from within Japan, and buyers expecting local delivery. Since we live in Berlin, and sell from there, it makes those things tricky some times. We'll look into it though.
The downside I think is that users on said app are conditioned to expect pretty steep discounts.