I love to wear and admire suits, and there is nothing sexier on a man along with the accoutrements of cufflinks, ties and shoes. And you don't need to spend a fortune on a suit either, it's really all about the fit. A suit should follow the contours of the body and frame the bum nicely. I like to wear boxers when in a suit, so that my stuff hangs down the left trouser leg and draws attentions from men and women alike. I have a few pics in my profile...but I am a bit rumpled during a session. ;-)
As a UK-US binational, I have to say that US suits generally do nothing to flatter a man. They are boxy and fit like tents and people don't seem to make any alterations, or they are so ill-fitted that they are beyond alterations. The worst is when the a too long crotch rise and rear end billow in combination with oversized pleated legs...it gives the effect of a shit-filled nappy/diaper. My advise for off the peg/rack, ignore the sizes and try as many on as possible to see what flatters you individually. Try the slim-cuts, sports-cuts, and european-cuts. Then find a good tailor to tweak it in all the right areas to flatter you.
Even better, if you go online now, you can have a "tailor-made" suit created in India or Nepal or China for very reasonable prices. I've done this, you go to a centre to be measured or do it online with a guide (if I recall it's 27 measurements), then a few weeks later it comes back, and it's like a glove or needs very minor alterations. You'll never buy a store-bought suit again.
Always stick with the basic wool fabrics and colour choices for a timeless masculine look.