Is the reason you change your jammies linked to your name?

Sorry, I couldn't resist.
My answer depends on whether I have my kids with me or not!
I personally think we wash our clothes too much anyway. I was just reading that a "jean" expert said to wear then 7 to 10 times before washing if they are not stained. Washing degrades the fibers in clothes.
I typically shower before bed to so my clean body is going into the jammies. I don't really sweat at night and I typically take one pair for 3 night stay. For a week I would take 2. I do like the nylon nightgown idea though. I would rather have room in my suitcase for souvenirs!