Look for alpaca as well. I found a second hand one for around ten bucks at a consignment shop.

I run my hand along the sweaters, disregarding color or style. If my hand hits a soft and natural feeling knit, I pull it out and check the tag. If I am lucky, I will have found something lambswool, in my size.

I went down the long sleeved shirt aisle running my hand as well. When my hand hit on something that felt microfiber, I pulled it out and it was an under armour top (retails for around 28/30 bucks.) Three dollars.

Bottoms are harder. But if you look, they are there. If your local goodwill stinks, go to a city goodwill - better selection and generally better clothes. Also, check your local consignment stores. Often they have seasonal sales to clear space for the new season's consignments. You can get really good deals on gently used name brands.

I can't even set foot in a department store anymore. I'm second-hand spoiled.

Be creative.

Think high-vis.
Think comfort / fit. Know what you like., brand wise, and quality wise.
If you see a really good deal, like, an ugly (but nice under layer) top for 50cents, grab it. Try it. If you hate it, donate it back.

I found a pair of frye boots recently for ten dollars.
This is the kind of deal that is so ridiculously good there oughta be a law.

I envy the messanger bag dudes around here. They go around with second hand old men's pants cut up at the knee, t-shirts, and bandannas. They look so incredibly hip and devil-may-care. I emulate that. It's cool to buy second hand. Plus, it's hard earned money saved.