I don’t see looking at professional athletes as any more relevant to most men than women looking at runway models. Unless they spend three hours a day in the gym, very few men have the body type of a NFL player. If they are built like a NFL player, nothing OTR will remotely fit right anyway.
I like the fact that classic suits look good on a wide range of folks, not just folks with a special physique. Personally, I have not yet seen anyone wear the latest fitted shirt suits and look nearly as good as most folks look in classic suits. The new trendy ones just look too small and uncomfortable, plus are NOT flattering.
Yes and broad shoulders, Big biceps and thighs do not look good in that style no matter how much $$ get thrown at it. Those types of guy builds couldn’t “do” the skinny leg emo/hipster look a decade ago either. Fashion forward often doesn’t work for all. Brides tend to try and figure out dresses for attendants that work for all the BFFs with different builds and the same practice should apply for the groomsmen in my opinion.
I think what people are talking about are the Pee-wee Herman style suits. They’re super tight in the arms and legs, the sleeves are 2-3” too short, and the pants stop mid-ankle or higher. Those look flat out ridiculous on anybody, IMHO, in addition to looking crazy uncomfortable.
Athletic-fit is an entirely different thing. That’s just a nicely tailored look that’s quite flattering if you have the right body shape for it.
@roethlisburger My comment re: athletes was directed towards @momofthreeboys’ “My big athletic guys”. Plus, not all professional athletes are NFL players. David Beckham looks pretty good in a fitted suit. 
I’d also argue that all suits, even those not bespoke, need tailoring. But of course, everybody should were suits that fit their body type and fit their image. Traditionally cut suits don’t look good on all types of bodies either. That’s why even Brooks Brothers, the bastion of conservative suits, offers a much larger range of cuts these days than they used to. Just like young women, when I guy has a fit body and spends time working out, he might as well show it off in a nicely tailored suit while he can, instead of something baggy.
Pee-wee Herman suits are an extreme. I have seen a lot of lean cut suits worn by grooms and their groomsmen. I can’t say I’ve seen extreme Pee-Wee Herman suits at weddings.
Nicely tailored is great—I agree. We will be going for that look with H and S also has nicely tailored, fitted suits but NOT the short suits that I feel look like a bad costume.
Yup the Peewee Herman suits. Silly looking. Big difference from a Euro-cut suit.
IMO, the rise of online shopping led to a lot of ill-fitted clothes. “Mail order” and “nicely tailored” do not mesh well. Especially for folks who have no idea what a well-fitted suit should look like.
Depending on where one lives, there may be a tailor/seamstress who can make a bargain on-line purchase look great. Even with the tailoring costs, one should still come out ahead. YMMV.
Many young men (yup, especially West Coast dudes) would not want to make the effort. Sorta fits… sorta works. You are an outlier, ski. 
My S has not owned a suit since HS, when he, like many fellow youth symphony members, had a cheap black one that passed as a tux with an equally cheap tux shirt/tie/cummerbund kit. Renting a tux twice a year did not appeal to many of us, even those who could easily afford it. he does have the classic navy blazer and several very nice jackets to wear with slacks…although they are probably less fashion-forward than he would like, since they were bought under Mom’s supervision while he was in college, and Mom is a Brooks Bros type, born and bred.
My H is a tall, athletic gym rat who looks great in everything. I used to particularly love it when he would wear his classic seersucker suit in the summer, with braces and a bow tie. He used to wear (real) bow ties a lot.
At our wedding, which was in the summer and not formal, the men wore tan summer suits. I and the bridesmaids wore tea length dresses.
I’ll preface this by saying everyone should where what makes them happy (where the law or corporate guidelines don’t supersede personal freedom) but the only time “Brooks Brothers” belongs in the same sentence as “fashion-forward” (or trendy, in vogue, etc) is if “oxymoron” is also in the sentence. =))
Late to this thread, but I had the same confusion. We were invited to a wedding, “Black Tie Optional” , ok, that was easy, I could wear my tux if I wanted but figured (correctly) most men would be in a suit. Then another wedding said, “formal” so I thought they expected me to wear a tux, and got my 2 sons’ tuxes up to speed also. Then I looked it up and found that “formal” and “Black Tie Optional” mean the same thing, but we wore our tuxes anyway and looked great.
Wondering if I can wear my street-length, sleeveless black sheath dress…Any suggestions as to how I can spruce it up and make it look dressier?
What about your jewelry? That could spruce up a nice dress!
Jewelry and a nice wrap/scarf plus elegant footwear can make a world of difference.
“The blue suits today are very trendy with the brown shoes.”
^^^ This.
At the two weddings we were at this season that my S came to - he wore a blue suit with brown shoes. A lot of the guys in their 20’s-30’s also wore blue suits with brown shoes.
Here is the most important detail - what color were their belts and socks?