We have the best department stores in the world, many with branches in major countries (just look at the major malls in Dubai). The UK department store brand is highly regarded by people from Asia/Middle East/Africa... so why on earth would you want to buy from an American department store, and besides American stores only sell pastel coloured polo shirts and checked cotton trousers
The things I'd have been most likely to buy wouldn't (unlike me (popcorn) ) really have size issues, scarves, watches, mugs.
They don't sell everything they stock to the UK.
Have used Macy's before for a Michael Kors handbag for the wife's Xmas and worked a treat. Delivery was within a week.
The Americans haven’t fallen for that scam.