Material/Product ideas???

I am looking for any suggestions for materials I could use in relation to a costume I am constructing.Basically the costume will include a bodice in which the center panel requires a product which is smooth and moldable that will be layered vertically in sections as to look like armour....The bodice will be constructed seperately and the panels will be attached later so it doesnt require any support or strength to the costume.This "armoured" section will be sprayed with a chameleon/harlequin effect (colour changing effect that is sometimes used on cars) this is why it needs to be smooth,rigid and non porous....All suggestions would be most greatly appreciated. In the future I also look to make a full bodice out of a moulded material to be sprayed with a chrome effect.Any ideas???