It would be interesting to see which of this year's purchases are going strong seasons from now. I tend to view knit tops as the least durable of all my clothing categories. Didn't even consider jeans, to be honest. But I know exactly what everyone is describing with the Lucky denim. I had one of those softer, velvety pair that I gave to a coworker, since they were just too low on me. The fabric was great!

This is a fun thread ! In the past, I have had many, many things. But the winner, to this day, is a pair of tall, waterproof leather boots that I bought when I was 26 . I am 50, now. Step back !!! I had just started my corporate job in November and I really needed good looking decent boots to trek around meeting customers on site. It was a huge amount of money back then : $125.00. I took very good care of them. Those boots have been through sleet, rain, snow, travel, sub zero temps, you name it. They still look awesome.

A blue plaid, wool Forever 21 coat from about 20 years ago!

My tall Born boots from about 9 years ago have held up wonderfully - cost per wear at this point is <$0.50. I have a pair of Hunter Wellies from 10-ish years ago that have held up nicely too, but I wear those less frequently.
Surprisingly, I have several items from H&M - cotton sweater, linen pants, linen shirt, cotton jacket, a few T-shirts, even a couple of camis - that have held up really really well. Their labels often suggest cold water wash and line dry, which I do, and they are holding up nicely.
For running/gym gear; I've been very happy with the things I've purchased from Athleta (both before and after they were acquired by Gap - I like their colors and cuts better now and the quality seems to have been maintained). For outdoors gear I like Prana, Mountain Hardwear and Marmot.
I should also add, although I had low expectations, I've been impressed with the utility and durability of my black North Face Resolve Rain Jacket.

Another vote for a Lands' End Squall Parka. I had worn mine pretty much every day between November and March/April from 2003 to 2011, until I just got so tired of the color I bought another (LE!) puffer jacket to alternate with it. Every year I check to see if that year's model is as good as the one I have (same insulation, zippers, pockets) but I'm not having any luck finding a replacement.

REI gear. The tops are faded, but no holes. The cargo style hiking pants with the zip-off bottoms are still going strong. It's been eight or maybe even twelve years of weekly wear for the tops and half-weekly wear for the pants. I am afraid that any replacements won't be as hardy and practical so I'm spending my money elsewhere. In two years when DD graduates from college and we aren't making college payments, I'll look into replacements.

REI gear. The tops are faded, but no holes. The cargo style hiking pants with the zip-off bottoms are still going strong. It's been eight or maybe even twelve years of weekly wear for the tops and half-weekly wear for the pants. I am afraid that any replacements won't be as hardy and practical so I'm spending my money elsewhere. In two years when DD graduates from college and we aren't making college payments, I'll look into replacements.

I've gotten a lot of use from my Eddie Bauer Travex skorts. I stumbled upon them when looking for something to wear on a vacation to Mexico in February (uh, the day before we were leaving... yes, need a keeper.) These are great! I can hand wash them and they are dry and ready to wear again in a very short time. They are in their third year with no visible wear or fading.

I have some surprises in this category. One that comes to mind is a Lululemon jacket I bought in SF about 7 years ago. It has been worn and washed countless times and still looks perfect. In fact, I have a newer jacket from them that I don't like nearly as well -- it's about 3 years old and the fabric is pilling a bit.

I have a Max Studio silk shirt that is at least 15 years old -- still looks like new. Ditto to a silk Lafayette 128 shirt.

My jeans are all winners in this department -- Paige jeans that are 3-4 years old and frequently worn still look good. 5-6 year old David Kahn jeans that were long ago retired into cutoffs or relegated to grungy wear were downgrade because I shrunk in size, but the jeans are still totally wearable.