I was in DC with friends and the Museum of American History had a bunch of different costumes on display.
Here are some of the First Lady gowns. Sorry, I was bad and don't have identifiers on a lot of them. They're mostly quick snaps. More info here: http://americanhistory.si.edu/exhibitions/first-ladies
Lou Hoover in 20s:
Michelle Obama's gorgeous dress. I love the way she dresses and I think she's very stylish.
So pretty! Not from a first lady.
Silk regency era shoes
Edith Roosevelt's inaugural gown - the pattern for the fabric was destroyed so it couldn't be copied. Haha, they didn't have spoonflower then!
Grace Coolidge's gown
Sandra Bullock's space suit from Gravity:
Costumes from My Fair Lady: