According to Kathy McKeon, the first lady's former assistant, one of Jackie Kennedy's legs was slightly longer than the other. To make up for the difference, she had a small platform installed in one shoe out of every pair. As McKeon wrote in her memoir, "Jackie's Girl: My Life with the Kennedy Family," "The bedroom walk-in closet was jam-packed with Madam's everyday clothing, all arranged according to color," but, "more intriguing to me was the quarter-inch lift affixed to one heel on each pair of shoes, apparently meant to compensate for one leg being slightly shorter than the other," (via PopSugar). 

So, despite what you may have been told throughout your life, you can blend fashion with function. Jackie O wasn't the only one in the family with this unique condition, funnily enough. Allegedly, President JFK himself also had a slight discrepancy between his legs, something which caused him severe back pain and led to the president wearing corrective shoes of his own. So, if you're noticing a persistent ache in your spine, talk to your doctor about shoe inserts — it may be just the correction you need.