It's no secret that we regularly look back to Princess Diana's iconic style for present-day outfit inspiration. From her vacation looks to her casual sneaker style, the people's princess's style is as relevant as ever. So with engagement season upon us, we decided to revisit how she perfected wedding-guest style in her own way. We dug through the archives to find out what she wore to various ceremonies throughout the '80s and '90s, from a viscount's wedding in Windsor to the nuptials of her former roommate, Anne Bolton. (Hint: Per royal customs, she always wore a chic hat.) Lady Di particularly favored skirt suits for weddings, but she added her own flair to the staple by choosing bright colors and fun patterns. (Neon green, anyone?) Scroll down to see Princess Diana's best wedding guest looks of all time and shop royalty-worthy skirts for yourself.