An article of footwear formed from a flat pattern to include a side seam and/or utilizing aperture alignment of multiple flat pattern pieces is disclosed. In aspects, an article of footwear, such as an upper, is formed from a flat pattern and modified into a dimensional article of footwear that includes a side closing. The side closing may comprise adjoined side edges of the flat pattern upper that are secured to each other with a securing element to maintain the dimensional article of footwear in its shape. Alignment of the parts may be provided through at least partial alignment of apertures in the flat pattern upper and apertures in a securing element and/or other flat pattern pieces, including using multi-purpose apertures, allowing streamlined processing and manufacturing of footwear.