But I just spent 5k on a brief made of the most luxurious leather and 10k on bespoke paperweights!
Let me see if I can get this thread back on course. The OP asked what works vis a vis clothing.
Through history, there have been many examples of large men that look great. It's not easy to change your body, but it is really, really simple to change your wardrobe.
First off, good grooming works wonders regardless of body size and weight. Pay attention to your haircut and shaving routine.
If you wear glasses or sunglasses, get good ones: classic, trendy, stylish, whatever; just get good frames that match your face.
Now, for clothes. Light colors are not your friend. Horizontal stripes are your enemy. Clothes that reveal your belly (I am assuming you have a large belly) do you no favors. Pleated pants add pounds to your waist/thighs. Baggy pants or pants that are too long just exaggerate the schlubby look. A real problem with trying to fit shirts or jackets over a belly is that they tend to really angle up or down when viewed from the side. Similarly, shirts are nearly impossible to keep tucked in over a large belly. A huge (no pun intended) problem is keeping the band of flesh between the top of your pants/shorts and the bottom of your shirt from being exposed.
If you are large, you do not do yourself any favors to try and squeeze into clothing that is too small. If your neck is now 18," then get proper sized shirts and stop strangling yourself with your outgrown 17" shirts. Tight pants cause misery: they look tight, and they give you stomach problems all day.
Regarding footwear, get good, sturdy shoes. I think big men in dainty shoes look ridiculous (especially if they have tiny feet). If you have a lot of mass, then place that on a solid foundation. Brogues and chukkas look good.
I've seen a lot of large men try to distract viewers from their stomachs by wearing outlandish hats or sporting weird hairstyles. Don't.
So what works? Good grooming. Good posture. Clothes that are slightly loose. Wear shirts that are designed to be worn untucked (Tommy Bahama shirts are great for this). Anything that masks the belly-line divide between shirt and pant is great: sweater, vest, jacket, etc. Plain-front pants that are not too long (pants will fall down as you move, and a short break in the pant cuff will quickly turn into 6" of pant bagging around your ankles). Suspenders are far superior to belts (they keep your pants at the proper height, they allow you to wear comfortable pants, and they help keep your shirt tucked in). Get rid of your bulging "butt-brick" wallet and get a slim card-case and money-clip (you don't need to add another 4" of wallet to your posterior). Good shoes. A really good wristwatch.
Most important: walk around with the air that you are proud of who you are and what you do or have accomplished.
Now get out there and swagger!
Then why do you get fat and skinny people in the same family if it has to do with their habits? Obviously they inherited different sets of genes in these mixed families. Then you have families where it's more consistant and the members may all be stocky or slim. And how do you explain identical twins who are the same genetically and were separated at birth and brought up in different households? The twins still look identical and only vary by a few pounds even though one may have been brought up in a fat family and the other in a slim family.
This is a complicated subject and it's not as simple as just telling someone to go on a diet. Most fat people have gone on a diet and lost weight but they seem to regain it eventually. Obviously they just don't feel normal and are unhappy eating a meagre diet and most don'teven have to eat a lot to be overweight. Then you have people who are not genetically fat but they have a psychiatric condition and are compulsive eaters and may consume 10k calories a day. You can probably cure these people but what do you do with someone who is fat and only eats 2k cal. a day? You have to eat and can't live on 500 cal a day for life. Most people who are overweight from eating too much are generally only 20-30- lbs overweight and reducing their consumption to normal will make them lose the weight but when you're a 100 lbs overweight it involves a lot more than just calories and as I said it very poorly understood. Very few fat people suffer health problems from being fat, it's all exaggerated and it's mostly a cosmetic problem where they just want to look slim.
About 30 years ago they started with this low fat diet nonsense and today people consume a tiny fraction of the fat they used to but there are 5x as many fat people.Perhaps people should be eating more fat since fat is burned as energy and is not stored as fat in the body. A lot of that dietary fat was replaced with sugars, starches and chemicals in foods. You also have super sizing where all portions are much larger than in the past and this too contributes to overweight. Personally I think fatness is mostly genetic but all of these other factors contribute to the problem. Let me just mention metabolism. They've done studies and fat people actually have faster metabolisms so how do you explain that. As I said, this is not a simple problem.
As a child I was skinny. My father who was built like an Olympic swimmer (which he was) used to make fun of me. It wasn't until I was 20 that I had a more manly body and weight and no, I am still not fat today.
And I don't googleor use amateur sites like Wiki. That stuff is for kids and proles. They read some nonsense there and then think they know something
It's still all genetic and many people who use opiates are still fat. Sure, perhaps someone using heroin will lose some weight (mostly due to the lifestyle and not the drug) but once they stop they will blow up if they have the predisposition to be fat. I've seen it many times as a doictor at the hospital.
I guess it does tend to make most Americans cringe because they are in denial and like to delude themselves into believing that they can accomplish anything. Of course older and more sophisticated societies know this is nonsense. Even in the US most people end up pretty much as they started out.