An awesome replica!
We make our cuirass the way Russell Crowe's was. The base is flexible foam, covered in leather, trimmed with more leather, and lined with even more leather. The front and back pieces connect with straps on the sides and laces at the shoulders. The emblems are cast in durable resin and finished to resemble metal. The cingulum (that's the skirt/strapy thingy) is also made from leather and attached by a hidden lace together strip on the inside. The cingulum is also all leather.
Thanks to the adjustable straps, one size fits most average sized guys 5' 8" up to 6' 4" and up to 210 lbs. Spaulders are sold separatly.