66 (center) models a dress made from Duraculon.
Indestructible fabric developed by a Mr. Winters
When Mr. Winters requests government help over fears that KAOS is after a dress made from the material, Chief Maxwell Smart assigns Agent 66 to go undercover as a model at a fashion show and partners her with his son Zach on his first mission as a field agent.
[GS95 Episode #1: "Pilot".]
Note: Duraculon should not be confused with the similarly indestructible Permafin.