Clothes she wears sell out. It’s an economic diplomacy matter.
LOL you are way more positive about the situation than most! I just can't see it that way.
Just to illustrate the power of even a two-bit minor royal: an acquaintance of mine owns a fashion brand in Australia. Princess Mary walked into their shop - for a few minutes - on her visit to Melbourne. That chance visit generated sales for the brand that bought my friend an in-ground heated swimming pool. Multiply that by Kate’s media pull!