This is great. Thank you all!
Some Egyptian friends of mine refer to simple galabeyas as "family clothes" and definitely do use them as Zumarrad describes -- changing out of work clothes into something casual and comfy for evenings at home. It reminded me of the way very simple yukatas are used in Japan in the summer, if that means anything to anyone.
Tammy (hi, Tammy!), now that you've mentioned having a pink galabeya I swear I've seen a photo of you in the same style and color I'm buying. Possible? (Of course, we're practically twins anyway. Your red assuit dress sends its regards.

)
Again, thanks, folks. Very useful ideas and information here!
Suzana