you need design based views? take a look at how almost everything supreme produces is a rip-off yet it is still wildly popular. go on the "supreme rip-offs" thread on ss and you can see exactly how much they copy from other brands. Then make a connection as to why consumers still choose to pay more for the same designs and wallah... there is at least two pages of work right there
Not a good example because I can easily say they have the same inspiration or are trying to pay tribute to that design, person, or whatever it is. Streetwear brands in general are all going to have similar designs because they're all basically inspired by the same things/people/events. They're all catering to the "lifestyle" aspect of skating/extreme sports/graffiti. Supreme is most desirable because of their reputation and history.
Brands and logos are how people identify themselves with the product or the product alone. It says something about a brand with a weak logo or signature design. LV, Gucci, Coach, Doonie & Burke all have a very similar signature design. Doonie & Burke is a very Gucci esque Coach bite, Coach is a Chanel esque (as far as the C placement on bags) LV bite (as far as the all over print aspect).