Hmm... love the idea, and it'll probably make money, but the problem with anything like this (even magazine ads) is that cut is paramount and people come in different shapes and sizes. Clothes fitting properly matters much more than what they look like on the rack, and more often than not, cuts at discount stores are either atrocious, or they are designed for fit models (those lucky jerks).
I can go to uniqlo, i can buy a shirt that fits my sholders great, at target? Forget it. Back at the uniqlo, i may try going to their jeans section, but nothing fits me, nothing. I have to get levi's because i have odd hip/leg ratio and they are the only firm that can sell me that cut for under $100. I am limited excessively by this... and we are only talking about basic blue jeans.
The celebs look good because they have the time and money to buy stuff that fits, and looks great together. Imitation may be a great way to same the time, discounted imitation may be a way to save the time and money, but i think that in neither case you'll look good.
The best thing to do is to get into looks as a whole, and once you have decent taste, buy thing that work for your body. It's not easy, and it may not be as cheap as these places try and get you to believe you can do it for, but at the end of the day, you'll look good, instead of a crappy version of Zac Efron.
Also, please find some less perfect celebrities. I can go on reddit's male fashion advice and find things that fit skinny people all day, and I can even find things to make Chris Farley look good (because there are only two sizes on MFA, skinny and fucking huge), but try to find fashion advice for a Zack Galifianakis. Doesn't exist.
When you're skinny, it's not hard to look good or copy styles. Little more difficult when you have a few pounds.
If Uniqlo fits you well, try any of the Mossimo shirts at Target, v-necks or crew necks. Cheap and good enough quality. (Gleaned that from /r/malefashionadvice.)
Otherwise, for the shirts and pants that almost fit, find yourself a good tailor and have them adjusted to your body. It's not expensive at all for basic adjustments.
There's a lot more to fit than BMI - body shape, for example.
And in fact matching the right Colours to your skin tone and style will have a greater impact on how you look (and feel) than the right fit, although both are important.
Seconding many of the other comments regarding the similarity between Uniqlo and Target. I have a few oxford dress shirts from each (Merona brand at Target) and they appear to be so similar in cut, fit, and quality to be from the same factory. There are subtle differences in the collar styling, but they aren't noticeable unless you hold them up next to each other.
But if you found a shirt at uniqlo, haven't you already found a cheap shirt?
Pants are easy to shorten, so if you find some that fits at uniqlo, except for being too long, have them shortened. They provide this service in-store at uniqlo in japan, I don't know about the US.
I can go to uniqlo, i can buy a shirt that fits my sholders great, at target? Forget it. Back at the uniqlo, i may try going to their jeans section, but nothing fits me, nothing. I have to get levi's because i have odd hip/leg ratio and they are the only firm that can sell me that cut for under $100. I am limited excessively by this... and we are only talking about basic blue jeans.
The celebs look good because they have the time and money to buy stuff that fits, and looks great together. Imitation may be a great way to same the time, discounted imitation may be a way to save the time and money, but i think that in neither case you'll look good.
The best thing to do is to get into looks as a whole, and once you have decent taste, buy thing that work for your body. It's not easy, and it may not be as cheap as these places try and get you to believe you can do it for, but at the end of the day, you'll look good, instead of a crappy version of Zac Efron.