Size adjustable cap

Claim 1

A cap that has a head encircling portion which is adjustable in size between a first size and a second size that is larger than the first size by a predetermined amount that is sufficient to provide for adjustment between a first cap size and a second cap size, comprising; a tip panel which has a front end and a back end, a side panel and a peak panel, the side panel having a posterior portion which extends around and across the back of the cap and anterior portions which extend from opposite ends of the posterior portion to the front of the cap, the side panel also having an upper edge, a lower edge and a front edge and being shaped such that when said side panel is laid-out flat, the posterior portion is arcuate in shape and the upper edge thereof extends along a shallow concave arc of curvature and the lower edge extends along a convex arc of curvature, the arcuate length of the lower edge of the posterior portion being greater than the arcuate length of the upper edge of the posterior portion by an amount that is at least equal to said predetermined amount and wherein, when the cap is assembled, and elastic member is fastened at its opposite ends to spaced points on the posterior portion adjacent opposite ends thereof and adjacent the lower edge thereof, said spaced points being spaced a sufficient distance from one another and said elastic member being sufficiently elastic to draw the posterior portion inwardly along said lower edge to reduce the length of the lower edge of the posterior portion by said predetermined amount to provide the first cap size and being sufficiently extensible to permit the posterior portion of the cap to be expanded to provide the second cap size.