Girl packs for a work trip

I have recently changed jobs, and consequently the type of business travel has also changed. In my last job it was overnight trips to Brussels. I got the packing for these trips down to a T. See, if you are a guy, your packing is a cinch, or so it would seem from the raft of suit clad men whose company I would routinely join on the Eurostar. These men would travel with only a backpack, which I am guessing, fairly accurately I imagine, contained all the papers and gadgets they needed for 24 hours, plus a pair of boxer shorts, a shirt, and a freebie mini bottle of shower gel. Maybe a deodorant. And that is it. See if you are a woman packing for a work trip isn't just a different affair, it is a different planet. It requires evening wear and boardroom wear, it needs travel wear that is smart but not frigid loooking, comfortable but not slouchy...I could go on. After a few of these trips I had it totally sorted. A cool looking wheelie bag just slightly larger than a briefcase, holding mini versions of all my make up and skincare, just enough to last one squirt of face cream or one squeeze of toothpaste, plus one jacket and two dresses, or one dress and two jackets. Easy. But the trips I have to do now are long haul and therefore more in the 3 to 4 day bracket, which change of circumstance has caused my brain to short circuit. Do I travel in comfortable clothes and then change? We are no longer in the eighties so no more business class, and we ALL know what economy class does to smart clothes. Or any clothes, frankly, Economy class is gross, exhausting and ageing, and requires a Battle Plan. What do I end up with? Smart but casual trousers with my trusty patent leather DMs which look amazingly cool with work dresses and would do for the boardroom or for the trendy dinners I reckon we will be tucking into in NYC. Stretchy dresses that scrunch up beautifully without wrinkling. One, ,just one jacket. Pair of boots. Will I only need these clothes??? No, of course not. But this is NY I am going to. When I run out, Macy's is a block away.