A dynamic vent-slit structure for a lower body article of apparel (1200) is provided. The article includes a pelvic portion (1202) for covering a pelvic area of a wearer when the article is in an as-worn position, and a plurality of slits (1240) in a repeating fashion, wherein a spacing (1228) between two adjacent slits (1230) in linear alignment is less than a length of a slit (1232) in non-linear alignment with the two adjacent slits and that the slit in non-linear alignment is offset from the two adjacent slits such that the slit in non-linear alignment overlies the spacing between the two adjacent slits in linear alignment, and the slit in non-linear alignment is parallel to the two adjacent slits in linear alignment. The slits may be positioned in one or more groupings or aligned in different directions to open in response to different directions of stretch or movement, to provide dynamic or motion activated venting in the article.
