1. Yes, absolutely the pink works with darker skin!2. In my experience they don't get much tighter with washing but they may get a bit shorter. Cold wash/hang dry is always a good idea.3. Definitely works with darker trousers4. I've never worn mine untucked. The curved hem makes them ideal for tucking, imo.5. Not sure, but if you find a place with more XLs let me know too!