Question for the men...about suits

Fair enough. Yeah, try looking at the Joseph Aboud at Moores first. If he doesn't find something he likes at Moores, he can also try The Bay.

He could try and wait until November when they have their holiday sales but if he's a standard size (chest between 34" - 42", waist being 6" smaller than chest), I wouldn't wait too long as they tend to sell out fairly quickly.

Another option is, depending on how early he'll arrive to the Niagara area prior to the wedding, try the outlets since you have a Banana Republic Factory and Saks Off 5th Outlet near you. It would be a bit of a gamble since it will be post-holiday shopping and cutting close to your wedding but if he can fit most off the rack stuff without taking in the waist, then he can get a crazy deal and likely a much bigger selection than what he could find in North Bay. Not to mention you can be a part of the process (if you want, it would take up time from your own schedule of course).

I would highly recommend him getting the suit where he's at so he can try it on and get it altered if he needs to at the store (it will cost extra). Most likely he will require hemming of the pant leg and shortening of the sleeves, maybe a taper for both pant legs and sleeves if he prefers a more slim look. Depending on his body shape, he may need to take in the waist.

I suggest Moores, since there's one in his town. Sign up for the newsletter and you can find out which week the suits go on sale. My brother-in-law got a suit for under $100 because I notified him of the sale from one of those emails. If at Moores, aim for Joseph Aboud. It's their best cut and it's outer shell is 100% wool. Their other brands like Kenneth Cole, Calvin Klein, and JOE usually contains polyester, which is a cheaper fabric with a weird shine and not as breathable.

For the dress shirt, have him go to Moores or The Bay. They actually measure their shirts by neck size and sleeve length as opposed to small/medium/large for a more accurate fit. Aim for a 100% cotton shirt for comfort.

If he's very unlikely to wear a suit in his work and every day life, if you don't mind that it's not as formal, another option is a sportscoat. He can dress it up by pairing it with a dress shirt and pocket square, a nice watch, along with a black or dark grey dress pants he already owns and dress shoes. And in his everyday life, he can easily dress it down with a turtleneck, a denim shirt, jeans, chinos, etc.