FWIW, I own four JAB suits and they are all fused pieces of crap (two are signature gold). None of the suits have seen much use, yet the suits are literally falling apart. The lining in all of the pants has shredded away due to poor stitching, loose buttons, poor craftsmanship, etc. When you can buy one suit and get three free as with their recent promotion, red flags have to go up. Even their "new" gold signature line at $1,700 is fused. That's ridiculous considering you can get a full canvassed suit for $500 (http://www.ehaberdasher.com/servlet/the-4928/Benjamin-Sartorial-Suit-cln--43R-fdsh-44R/Detail) or a quality half canvassed M2M suit for $450 (http://www.blacklapel.com/suits/solid-navy.html).
I'm not taking up for JAB as I don't like the quality or the fit but it appears the Signature Gold line is half-canvassed with some on sale for under $400: http://www.josbank.com/menswear/shop/Product_11001_10050_357160
The signature Platinum is fully canvassed and made in Italy (I have no idea by whom): http://www.josbank.com/menswear/shop/Product_11001_10050_357203
That said, I wouldn't buy them. I have many friends who complain about how quickly their JAB suits show wear.