A footwear system, comprising: a first article of footwear including a first sole structure and a first upper secured to the first sole structure, the first article of footwear having a forefoot region, a midfoot region and a heel region, the first upper defining a first opening configured to receive a foot of a wearer, wherein the first upper includes a first indicia portion disposed adjacent to the first opening; and a sock including a second indicia portion, wherein, one or more features of said second indicia portion are suitable to be substantially aligned with one or more features of the first indicia portion on the upper to form a first indicia when the sock is worn by the wearer on a foot received within the upper; wherein the first indicia portion includes a first pair of elongate markings disposed on a rear of a heel region of the upper and extending in a substantially vertical direction; wherein the second indicia portion disposed on the sock includes a second pair of elongate markings extending upward and toward a medial side of the sock, and a third pair of elongate markings extending upward and toward a lateral side of the sock; wherein the first pair of elongate markings includes a first marking and a second marking oriented substantially parallel to the first marking; wherein the second pair of elongate markings includes a third marking and a fourth marking oriented substantially parallel to the third marking; wherein the third pair of elongate markings includes a fifth marking and a six marking oriented substantially parallel to the fifth marking; wherein each pair of elongate markings (142, 144, 146) are configured to extend substantially radially from a central region; wherein the first marking includes a first inner edge; wherein the second marking includes a second inner edge; wherein the first inner edge is substantially parallel to the second inner edge; wherein the first inner edge of the first marking is in substantial alignment with a third edge of fifth marking; wherein the second inner edge of the second marking is in substantial alignment with a fourth edge of the third marking; and wherein the sock includes a forefoot region, a midfoot region and a heel region. a first article of footwear including a first sole structure and a first upper secured to the first sole structure, the first article of footwear having a forefoot region, a midfoot region and a heel region, the first upper defining a first opening configured to receive a foot of a wearer, wherein the first upper includes a first indicia portion disposed adjacent to the first opening; and a sock including a second indicia portion, wherein, one or more features of said second indicia portion are suitable to be substantially aligned with one or more features of the first indicia portion on the upper to form a first indicia when the sock is worn by the wearer on a foot received within the upper; wherein the first indicia portion includes a first pair of elongate markings disposed on a rear of a heel region of the upper and extending in a substantially vertical direction; wherein the second indicia portion disposed on the sock includes a second pair of elongate markings extending upward and toward a medial side of the sock, and a third pair of elongate markings extending upward and toward a lateral side of the sock; wherein the first pair of elongate markings includes a first marking and a second marking oriented substantially parallel to the first marking; wherein the second pair of elongate markings includes a third marking and a fourth marking oriented substantially parallel to the third marking; wherein the third pair of elongate markings includes a fifth marking and a six marking oriented substantially parallel to the fifth marking; wherein each pair of elongate markings (142, 144, 146) are configured to extend substantially radially from a central region; wherein the first marking includes a first inner edge; wherein the second marking includes a second inner edge; wherein the first inner edge is substantially parallel to the second inner edge; wherein the first inner edge of the first marking is in substantial alignment with a third edge of fifth marking; wherein the second inner edge of the second marking is in substantial alignment with a fourth edge of the third marking; and wherein the sock includes a forefoot region, a midfoot region and a heel region.