Hi,
Kate.
How tall are you?
If you are above 5'5" or so, go to Chico's and get some black
Travelers pants and a matching top. They are every bit as comfy as jammies, look great and you can wear them for days on end. You can also wash them and toss them in a dryer.
If you are shorter, check out Nordstrom Petite Software pants. They cost about $70.00 bucks and are worth their weight in gold.
I have several pair of these pants, a skirt, capris, several tops and a calf-lenth duster which can also double as a long-sleeved shirt dress.
I frequently go to Europe with only one pair of these trousers and a bunch of different tops. Of course, we usually are only gone for 4 or 5 days when we go to Europe.