The best thing to do, is to buy the best gear you can afford, then it should last you many years.
I am still using certain items of clothing, that i bought as long ago, as 1982.
I still own a Berghaus Dart rucksack, that was purchased in Crickhowell, as long ago as 1981, its got years of use still left in it.
Also, i have a very early Berghaus fleece, bought sometime in the early eighties, and its still useable.
I am not suggesting gear people buy today, will last this long, but at the time, these items were the best available, and were slightly more expensive than the average kit.
I am not rough on my gear, i look after it, but the same can be said today, by the very best gear you can afford, and it can last many years.