A graduate of the Wrocław Academy of Fine Arts, she is a costume designer, set designer, and painter. She has designed costumes and sets for nearly 150 performances at the Wrocław Opera and numerous theatres and operas in Poland and abroad. From 1990 to 2005, she collaborated with the Stadttheater in Görlitz, where she designed costumes for 25 ballet performances. She has designed costumes for major opera productions staged at the Centennial Hall in Wrocław, including Aida (2002), Carmen (2005), Boris Godunov (2007), Macbeth (2011), The Pearl Fishers (2013), as well as outdoor productions such as Gioconda (2003, presented on the Oder River), A Masked Ball (2012, Wrocław Olympic Stadium), and The Flying Dutchman (2015, Pergola). She designed the costumes for all parts of R. Wagner’s Der Ring des Nibelungen, directed by H.P. Lehmann: Das Rheingold (2003), Die Walküre (2004), Siegfried (2006), and Götterdämmerung (2006), which were performed by the Wrocław Opera at the Centennial Hall for audiences of thousands. She also designed the costumes for G. Puccini’s Turandot, performed at the Lviv Opera (2020), and K. Penderecki’s Paradise Lost, performed at the Grand Theatre in Łódź (2023). For this production, she received the Best Costume Design award at the 18th J. Kiepura Theatre Music Awards. Her costumes were presented in 2008 at the Małgorzata Słoniowska Costume Design exhibition at the Museum of Bourgeois Art in Wrocław. Małgorzata Słoniowska’s costumes were shown at fashion festivals in 2008, 2009, and 2012, and were also presented at the Off Fashion Gala in Kielce. In 2008, the exhibition In the Space of the Universe/Labyrinth of Death – Visual Stagings of Krzysztof Penderecki’s Operas in Katowice featured costumes designed by the artist for the Wrocław production of Paradise Lost. The collection of the Polish Scenography Center of the Silesian Museum in Katowice includes costumes she designed for J.S. Bach’s Coffee Cantata and Peasant Cantata, both performed at the Wrocław Opera. The artist has been awarded the Bronze and Silver Crosses of Merit and the Bronze Medal for Merit to Culture – Gloria Artis.