the current one about 40 years old - there was an earlier one probably designed in mid 50s that was not economic to produce hence the redesign - there was an article in Manx Life in I think the late 70s but don't have ref to hand - try asking manx museum library@mnh.gov.im

There are a couple of Cowan photos under costume on ManxNoteBook that illustrate Sunday best late 19th C