John Galliano SS2003 Asymmetric Ombre Silk Dress

John Galliano ombré silk dress you're referring to is likely from the Spring/Summer 2003 collection. This is supported by listings of similar designs from that season, such as a bias-cut silk dress in ombré hues of yellow

one-shoulder design with an asymmetrical neckline and a gradient from light teal to yellow and back to teal, it aligns with the aesthetic of Galliano's Spring/Summer 2003 collection.