I have never heard of anyone taking that much clothing. Some folks get by with that much weight including tent, sleeping gear, and cooking gear. If you take anywhere near all of that be open to mailing a LOT of stuff home.

If by tshirts you mean cotton, I wouldn't take any, but I do take a very thin tech shirt.

None, but I usually take two short sleeved bike jerseys.

Two pairs of polyester socks are enough. Three at most. BTW no cotton!

I take zero. The only off bike pants I wear are zip off leg pants and running shorts, both with a mesh brief built in. If you must take them take one pair briefs (two at most) and wash them out as needed, but I'd skip them altogether.

No jeans or anything else cotton!

I might take two pairs of running shorts if I think I might swim in them and one if not. I wear them most of the time I am not in bike shorts including to sleep in.

I have never taken one. If it is cotton I definitely would skip it. I do take one warmish long sleeved tech shirt made of light pile.

Yes.

Only the pile one listed above.

Why, you have the zip offs?

Yeah two pairs is kind of nice. I could get by with one if I was really going light.

Never took one. I do take a very light pile cap.

I never have taken one.

You were probably already taking too much. Your friend lead you astray.

There are a few things I missed on your list. Depending on the expected weather consider:

• leg warmers or tights
• thin pile cap
• lightweight rain pants and jacket (I like the very light ones that come in a little stuff sack
• thin gloves (I use some that are supposed to be glove liners)
• possibly some off bike shoes. I have taken Crocs and they worked out well. On one trip where we hiked a lot (we spent a week in Yosemite) I bought trail running shoes, but I don't usually take them.