I got trainers for £12 that is bought here for £109!!! Also sone lovely handbags for a quarter of the price here and work dresses and shirts for under $30, levis jeans for $15. The malls and outlets had bloody brilliant sales.
I got loads at Target when I was there last year - great for kid's clothes, but I got stuff for myself too.
I agree - Washington DC city centre is almost devoid of shops, at least the bit around the Mall, the White house etc. Although I'm kicking myself for not buying a 'Donald Trump for President' comedy mug from the White House gift shop!