A footwear system may include a first article of footwear including a first sole structure and a first upper secured to the first sole structure, the first upper defining a first opening configured to receive a foot of a wearer. The first upper may include a first indicia portion disposed adjacent to the first opening. In addition, the system may include a sock including a second indicia portion, wherein, when the sock is worn by the wearer on a foot received within the upper, one or more features of the second indicia portion are substantially aligned with one or more features of the first indicia portion on the upper to form a first indicia.