Dress Shirt

How do you tailor a dress shirt for men?
I would like to tailor my dress shirts for an athletic build. Most US dress shirts are sold for a little heavier builds. Throw on a good set of shoulders and you’re probably buying a shirt for someone fairly heavy in the mid-section. Fitted shirts cost a fortune. Any tailors out there have a good method to quickly sew a shirt to fit nice? My wife would be stunned if I was the first to use her brand new sewing machine.
Thanks…
it all depend how you want to fit it, but first sow from the inside not from the out because then you will see all the lines
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