She graduated early after winning France's "National Young Design Award" and was hired by Jean-Paul Gaultier.

[8] After moving to New York City, Theallet continued to work with Alaïa on a part-time basis, while also freelancing for other fashion labels.

[9] In 2015, Theallet was a Couture Consultant for the movie The Dressmaker to Director Jocelyn Moorhouse starring Kate Winslet[10] Theallet is an advocate for inclusion, representation, and diversity in her Fashion campaigns and her Runway Shows [11] [12] In 2014, she partnered with retailer Lane Bryant to bring Fashion Luxury Design to the Plus Size market.

For example, the Spring 2014 show, which by standing convention was in fall 2013, generated comments from the reviewer that her work "established a tone of ripe sexuality".

[17] In 2018, she and her family relocated to Montreal where she founded her new label, Room 502, a limited-edition line that is entirely self-funded and sold only through their website.