Hear, hear! We packed all the clothes for all six of us for a month, in one pack, that was still light enough to carry, and had room for extra things we picked up en route.
Personally, I'd pack a skort (mine's a quick dry version from Columbia that I bought in Poland, as a matter of fact - so you can even get familiar brands) rather than jeans. Much lighter and I washed it many a time in the sink at the end of the day and wore it again next day.
If you can find one, I'd take a sarong rather than a shawl - it does the same thing, plus you can wear it as a dress/beach coverup, a skirt, or use it as a blanket or mat to sit on. Also, quick dry and the batik prints usually hide the travel grunge a bit til you can wash it!
I second the H&M, though I find Zara a bit pricey, except during sales. There's also a second hand chain called Humana (People to People) in some parts of Europe. They have good quality clothes for CHEAP, too. I think 95% of my kids' clothes come from there, and a good amount of mine.
My packing list for a month (just for me, I won't bore you with the kids) last year:
skort, capris, three tops, fleece sweater, sandals, 3 pr socks, 7 undies, 7 bras
