We got rid of all those clothes ages ago...
Sorry, there's nothing that beats real animal fibers for warmth and durability. Cashmere is the best stuff ever, particularly bought used and cheap on Ebay.
Cashmere? Heresy! Everyone knows merino wool is Best Fibre.
The problem is, ever since the advent of cheap cashmere from China, nobody makes good merino sweaters any more, because for only a little bit more money than good merino you can get poor quality cashmere and charge an extra $30-50 for the finished garment. I have two merino cardigans from Books Brothers and they are *lovely*, but rare as hen's teeth. I love all my handknit merino socks, though. I really should get on making myself more sweaters.
I'm in camp merino (though I do adore my cashmere thrift store finds, they really aren't as sturdy). Merino diaper covers, merino hand-knit socks, merino tights, merino bike jerseys (you can make them from thrift store sweaters, too), merino toddler hoodies... It's like MAGIC fiber—wicks sweat, absorbs baby pee and turns it into soap, breathable and warm even when wet...
I only have two hand-knit merino sweaters so far but I'm working on #3.