A cap includes an elongate track that extends along the lower edge of the crown has opposing free ends or edges when formed along a generally circular path. A slide, connected to the brim, can slide along the track. A pin or wire aligns the opposing edges of the track when brought into abutment to form an interface parting line. One or more tapes extend across the interface parting line to prevent relative movements of the opposing edges about the pin or wire thereby fixing and stabilizing the opposing edges at the interface parting line to maintain alignment and eliminate discontinuities at the opposing edges to insure smooth movements of the brim independently of the position of said brim along the track.