I’m a woman, too, but I pack light with ease.
I strongly recommend Ex Officio travelling clothes. They’ll simplify your packing immensely, because they’re easy to wash by hand in a sink and quick to dry. Not to mention that they’ll take lots of abuse. Oh, and they’re flattering, too. (Or, they’re flattering on me, at any rate.)
If you’ve got 2 of the Ex Officio travel T-shirts or other quick-dry T-shirts, a pair or two of quick-dry travel pants, and maybe a skirt or dress (wrinkle-resistant, and quick to dry–think nylon), you’re good to go. You could wash a shirt each night (it takes about 5 minutes) and have it ready to go in an hour or two. Same deal with the pants. This will save you time, in the form of not having to go to a laundry place when you could be looking at tulips or whatever. I would go with 2 solid color, neutral T-shirts, one or two solid color, neutral pair of pants, and a skirt or dress. Make sure everything color-coordinates, so that you can wear any item of clothing with any other item of clothing and have it look OK. If you’ll need a sweater or light jacket (I don’t know what summer’s like in Amsterdam), it’s good to make that sweater black or some other neutral color that could be worn with any other clothing you’ve brought with you.
If you’re going to wear comfortable hiking or walking shoes most of the time (which sounds like a good idea to me), you might want to pack a lightweight pair of dress shoes for when you want to dress up. Make them a neutral color that goes with all your other stuff. Go to Target or someplace like that and buy yourself a pack of underwear and socks and throw them in the suitcase or carry-on bag. If you want to wear stockings with your skirt or dress, pick up a pair.
It would make sense to wear one of your travel outfits on your flight from the US to the Netherlands. Then what you need to pack is reduced to one shirt, one pair of pants, the skirt or dress, underwear and socks, and maybe the shoes, along with your basic toiletries, any medications, your passport, and your wallet. You could do the whole trip with a carry-on.
The idea of packing an empty duffel bag is a good one, though. You’ll probably end up buying a bunch of stuff, but you won’t have anything to lug it all home in.
Have a great trip.