Last week Lauren reported that Gwen Stefani was suing Forever 21 for knocking off her designs. Today Vogue UK brings news of a similar suit, although not one as young and trendy. Levi has filed a lawsuit Polo Ralph Lauren claiming that Lauren is copying their pocket stitching. The Vogue article says that Lauren has imitated their trademark "arcuate" pocket stitching. Arcuate? I'll admit I didn't know the word so I looked it up. It basically means curved or arched. The jeans design is the oldest known apparel trademark in the US, protected since 1873 so Ralph and his team have some explaining to do. It would be very hard to claim ignorance of one of the most recognizable design styles.