Off the rack suits are really cheap here in Sydney, and stores like Johnny Big, Lowes always have items on sale, than you can take them to a Tailor if they need hemming,
but probably the best thing you can do is google tailors in the area you are visiting, and read up on shop reviews, than inspect some of the shops work they have just completed for a client that's ready for picked up,
also have in mind what you want made and be prepared to wait at least 2 weeks,
tailors also have off the rack regular size shirts already made,