Is Pierre Cardin a good brand? There's a pair of sunglasses for £89.Is it worth to buy it or are there better  brands for that price?

A designer name has nothing to do with the quality of the product. The manufacturer, usually of many brands, pays the designer to use the name on the product. The only interest Pierre Cardin has in the sunglasses is that they cost a lot and aren't too bad in quality, so that the brand name is not associated with cheap or bad quality goods. I'm sure you can get far superior sunglasses for much less money; probably quite stylish ones. However, if your goal is to show off how much money you can waste on sunglasses, you can't go wrong with Pierre Cardin.

All designer name sunglasses are made by two or three manufacturers. One maker, Luxottica, makes the majority of designer frames under a brand license agreement with the brand holder. There's almost no difference between any sunglasses made by the company so the 2000$ D&G are the same as the 100$ less known brand. My personal opinion is that anything over 25$ for non prescription fashion sunnies is way too much. I actually prefer the 2 for $25 ones at the tacky beach shops is tacky beach towns.  If you like the style and how they look on you and they protect from the glare of the sun then that should be the deciding factor, not the brand name.

i would say no as I bought a suit from them that was taloir made and on my first wear at a party the seam in the butt split opn