Standard Levi's Jean Jackets Men's Sizes Medium or Large Irregular Large Chest - 48" Medium Chest - 42" I didn't find anything wrong with these jackets, but there is a description of irregular below. If you buy and find something you don't like about this product I will offer free returns. An irregular Levi's jacket refers to a garment that has minor manufacturing flaws, which do not affect its wearability. These flaws are typically cosmetic and are often seen as defects that prevent the jacket from being classified as first quality. Irregular jackets are often sold at discounted prices, as they are considered acceptable for use despite the imperfections