Kaftans are your friend - casual and posh - ring the changes with accessories. Loads on Ebay at the moment. Shorter ones over pants, full length for evening - light to pack too. I've norkage too so v-necks are a good choice. Try to make sensible mix and match colour choices to make things go further.
I'd take 2 pairs of jeans and two pairs of cropped trousers ( my cropped trousers are Boden) , several long tops with mix of long, three quarter and short sleeves and say 4 simple dresses, of which one could be a maxi. And a couple of interredting necklaces and ditto belt. Plus one longline cardi or jacket, one long jumper, pissibly in cotton,one cropped cardi and one jacket/ trench that's waterproof. You can travel in the last of these, with one of the pairs of jeans and one of the tops.