I think there are different levels of luxury and I think Gucci, D&G, LV accessories could be categorized as luxury items.
I hear a lot of people say they just slap the name on the item and charge a premium and while that is somewhat right, it isn't 100% correct.
When it comes to shades, that for sure pertains to that as I believe Luxotica makes all the sunglasses for most of the designer brands out there, excluding LV.
But the belts, cuff links, shoes, etc... are made with better materials, adds their own details to it and to be honest, quality of craftsmanship goes along with most of these items.
I mean I have heard people say the shoe quality sucks, but from experience, I have had my Prada A-Cups for 3 years, the first 2 years, it was worn constantly 2-3 times a week and up to this day, it still looks good and quick wipe down of dust and it looks brand new again. And I purchased that shoe when Prada's shoes aren't made in Italy anymore either. The same with the belts I have, my Ferragamo and LV belts have held up well and when something is wrong with my Ferragamo belt, I just bring it to the store and they try to fix it free of charge, no questions asked. So I would say quality and service is part of the luxury category they belong to.
Again, there are different levels of luxury, like some people say Rolex is an epitome of luxury when Patek, IWC, VC, etc... can be categorized as way better.
Hell Omega is arguably better overall than Rolex and most people rank Omega below Tag Heuer, which doesn't even come close.
Rolex is also mass produced, making about a 700,000-800,000 watches a year compared to IWC's approximately 45,000-50,000 (maybe even less) watches a year.
I think everyone here knows and won't argue that we pay for the name, that is why we try and buy when it is on sale but in LV's case, it never goes on sale so for the most part, there is no point in waiting.
If you can get it now, why not? But i digress...
To those who aren't asleep yet with my essay like reply, again, to me luxury items aren't a reasonable or practical purchase, it isn't a necessity because we all know there is a cheaper alternative.
These accessories is an upgrade in quality, craftsmanship and service compared to the basic run of the mill accessories we find at Target or Walmart.
Like I said, there are exceptions but overall, these items has better qualities to offer, it might be a certain quality upgrade or prestige, or just a design not found anywhere else, but these items, in my humble opinion, are considered luxury and first hand experience has made me a believer. Now maybe if I move up another echelon, these things will become non-luxury but for now, it'll do me just fine.