We just took enough clothes to last for the trip. You should be able to many wears from a pair of pants, so take 2-3. Socks and underware (if changed every day) take up little room. Depending when you go, 3-4 sweaters should do you, and are great for packing return items in to avoid breakage. And if you figure that it's just like Fall in North America, a couple of t-shirts. And also a extra pair of shoes. We got by with a large case, a smaller one and 1 carry-on. As clothes got used, and were no longer going to worn, they were transfered into the smaller bag, where wrinkles didn't matter, so you can really stog them in.

Frank