I hope this helps, D Friedlander. I've done, in the past, a great deal of travelling with a limited amount of clothing (in order to get them in a carry-on; I hate checking luggage, but now with the new restrictions, it's hard to take everything on a carry-on, plus the airlines - greedy b*st*rds that they are - are now charging for checked luggage). Here's what to pack. One extra pair of pants or slacks. Make them "semi-formal" when you need to wear something for a more "formal" occasion. Make sure they're at least 50% polyester; cotton takes too long to dry and wrinkles. Wear jeans when you are flying. Pack about three shirts, maybe one or two more; again, check the material that's pretty much wrinkle-free. Take along socks and underwear that you can discard. I'm serious. Who sees them? Bring along a bigger bottle of shampoo (one that is now allowed with restrictions for size of fluids, plus don't forget that most hotels provide shampoo). Use the shampoo to hand-wash your shirts in your hotel room sink at night and hang them up on the shower-curtain rack. By morning, they should be dry (wrinkle-free shirts is the reason for this). Shampoo works just like Woolite (many shampoos will say they can be used for laundering hand washables).
I've spent weeks in Europe with just a carry-on, minimal clothing, and shampoo for hand cleaning. It works like a charm.
Gerard