(Alexander Kabbaz): Do you have evidence to back up this claim?
Just like a number of other things sartorial, it's somewhat subjective in nature. You may disagree, having used whatever machines you've been using for the very reasons that you liked them to begin with and still like them for. One shirtmaker whose services I've used has his small team of seamstresses using Pfaff machines. Another has his solo sempster(terminology?) using a DÃ¼rkopp Adler. Both makers have recent-model sewing machines. The evidence? The finished products. Both makers have the buttonholes beautifully done by hand. A maker I tried previously used a Pfaff lockstitch machine and a Brother buttonhole machine. The buttonholes came out well-made. Fortunately the rest of the shirt did too.
(ASK): s/Antique Shirtmaker
So that's the full form of A. S. Kabbaz - Antique Shirtmaker Kabbaz?
(in good-natured jest)