Take a video/pics of the issue and send it to him. If it's an error on his side then he'll fix it. If you gained weight between your fitting and now, then he might still fix it but…..
He tries to resolve most issues amicably.
One thing to keep in mind (not saying it's what's happening here): his stuff usually fits more snug than what people are used to. In America we buy shirts that have lots of extra material in areas, so we tuck them in, blouse them out, etc. With tailored clothing, it typically fits "closer" than what you're used to.
Hope you get it worked out
He tries to resolve most issues amicably.
One thing to keep in mind (not saying it's what's happening here): his stuff usually fits more snug than what people are used to. In America we buy shirts that have lots of extra material in areas, so we tuck them in, blouse them out, etc. With tailored clothing, it typically fits "closer" than what you're used to.
Hope you get it worked out