[harimau777]

Agreed.

I think it's probably a matter of degree or "tiers" of clothing.

It is probably almost always in one's best interest to buy from a higher quality (but not necessarily luxury) brand.[1] For example buying Levi jeans rather than Wrangler or a store brand.

Some people will notice if you are wearing a particularly high end item, but once you reach that "high end tier" there is probably diminishing returns for getting the highest of the high end. For example, I have had people notice the Swiss watch that my father gave me. However, it is basically the entry tier model for Swiss watches and I doubt I would get much benefit from instead wearing a more expensive model. For men at least, I suspect that wearing a luxury brand is probably more effective for accessories and shoes since mens fashion tends to follow a strategy of conservative clothing with more flashy accessories.

I think there is also a lot to be said for having some specific style even if it isn't fancy. For example, G-Shock digital watches aren't particularly "fashionable" but they are known for being very high quality. If someone who cares about watches noticed you wearing one they might not consider it professional or fashionable but they would likely recognize that you cared about your appearance enough to buy quality.

[1] When I say "always" I'm meaning for a professional with a good income. I realize that for people with lower incomes fashionable clothing may not be the best priority.