On Michelle Obama's final day as First Lady, designers celebrated her mark on American fashion with hand-written thank you letters. WWD rounded up some of the designers who dressed the First Lady over the years and asked them each to write a note celebrating her legacy—the end result was heartfelt, to say the least.

Seven designers, including Jason Wu, Joseph Altuzarra, Christian Siriano, Monique Lhuillier, Jenna Lyons, Prabal Gurung and Marchesa's Georgina Chapman and Keren Craig, submitted their own letters expressing thanks to Mrs. Obama.

Jason Wu, who designed the First Lady's 2008 inaugural gown, wrote a moving note:

"Thank you for your amazing support for not only me, but for every creative who dreams in this country. You inspire me and I am so proud to play a small part in your most extraordinary legacy. I can proudly say that I've reached my American Dream."

Michelle Obama in Jason Wu at the 2009 Inauguration Getty Images

In his letter, Prabal Gurung clung to the hope that Obama would someday run for president herself, writing, "Thank you for letting us be part of your history. See you in 4 years as our first female president."

Jenna Lyons of J.Crew, whose cardigans and pieces the First Lady wore many times over the years, took a more artistic direction in writing her inspiring thank you note:

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Read all the designers' letters to FLOTUS on wwd.com.

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