Every man needs a suit. Owning at least one can save you from dressing inappropriately in events that requires it like conferences, formal gatherings and weddings. A tailor-made suit would definitely be the best item to spend especially when you have an odd figure which barely match with the ready-made suits in the store. Needless to say, it may have fitting problems if you do not check it out before taking it home. I found an infographic that can help you on this one. Check this out.
Relying on the suit that looks good at the mannequin is not a good idea. This is because your body type would definitely be different from the measurements of a mannequin. Search for the top tailors in your locality. If you are working on a budget, compare their price lists and see who among them can give you the best piece on a budget. As you intend to have just one, get advice on the best color that will match almost all types of occasions you might attend.