Answer:
I am the yellow hem of the sea's blue skirt.
How can a pants pocket be empty and still have something in it?
What has one hand longer than the other, and goes on all day and night?
Brings the sky a lot closer.
Every country has one, though we are not the same. Waving to our citizens, throughout the wind and rain. What is it?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?