The Kate Middleton-approved brand Me+Em is expanding to the US. I visited its NYC flagship and saw why the royals love it.

• The fashion brand Me+Em, a favorite of the royals, recently opened stores in New York.
• I went to the store's flagship location on the Upper East Side to see if it lived up to the hype.
• The high-end store was inviting, and I could see why Kate Middleton likes the brand.

The royal family's fashion, from the brands they choose to the outfits they like to rewear, is often a source of fascination for the public.