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See all of the Duchess of Cambridge's March 17 looks throughout the years.
Green means reuse! Kate's 2018 appearance at the Irish Guards' St Patrick's Day Parade looked very similar to her 2017 one. The royal opted to wear a similar Catherine Walker coat to the event at Household Cavalry Barracks in London. Of course, she had a booming, notable difference - she was pregnant! CLICK THROUGH FOR MORE OF KATE'S PAST ST PATRICK'S DAY STYLE Photo: Getty Images
After missing the event in 2016, the Duchess of Cambridge returned to annual March 17 tradition in 2017, attending the Irish Guards' St Patrick's Day Parade at Household Cavalry Barracks in London at the side of husband Prince William. For the occasion, Kate wore a tailored forest green military-style coat with gold buttons and velvet trim. Outfit details: Bespoke Catherine Walker coat, Monica Vinader earrings. Photo: Dan Kitwood/Getty Images
2015 Pregnant with Princess Charlotte, Kate opted not for traditional green but a brown swing coat and high heels for the parade at Mons Barracks. Outfit details: Custom Catherine Walker coat, a favorite Lock & Company hat, Kiki McDonough earrings and shoes and clutch by Emmy. Photo: Max Mumby/Indigo/Getty Images
2014 That year, the Duchess of Cambridge visited the 1st Battalion Irish Guards wearing head-to-toe green, from her shoes to her hat. Outfit details: Military-style Hobbs ‘Persephone’ coat and royal heirloom Cartier shamrock brooch. Photo: Bradley Page - WPA Pool/Getty Images
2013 Pregnant with Prince George, Duchess Kate was showing just a hint of a baby bump for the St. Patrick's Day outing in Aldershot, England. Outfit details: Recycled Emilia Wickstead coat, altered for her pregnancy, and a Lock & Company hat. Photo: Samir Hussein/WireImage
2012 In 2012, the Duchess of Cambridge chose her favorite cinched-waist fit-and-flare silhouette and a dark brown pillbox hat to visit the Irish Guards in Aldershot, England. Outfit details: Emilia Wickstead coat, Kiki McDonough earrings, Lock & Company hat and shoes by Emmy. Photo: Chris Jackson/Getty Images