Probably during 1999 season (in 1999 the Patrouille Suisse celebrating 35 years of operations) a "party suit" was implemented, as a locally manufactured CWU-73. As its definition suggests, the CWU-73 was not used during flight operations, but only at formal/social events.
Since its replacement by the "red model", the CWU-73s have been assigned to the PS ground support crew.
Below a standard US CWU-73, which certainly acted as an example for the Swiss model. Note the left leg knife holder, not featured in the swiss one.