I don't think that he's wearing a pair of his own trousers, although Ethan is possibly wearing a pair of Ambrosi pents.
It looks more like Sav is wearing the same suit by "Formosa" that he was wearing when he was profiled by a "Men's Ex" in Japan recently. It looked waaaay too tight then (and I say that as someone who wears rather tight clothes at times) and it still looks too tight now. I think that the jacket is worse than the trousers, as well.
Subtext from the Armoury said the jacket was Formosa but he had made the trousers himself.