Answer:
Things here are usually tagged with red stickers.
My first is a heir; My second's a snare; my whole is the offspring of fancy; which I sent out of play upon Valentine's day As a token of love to my Nancy.
I am whole but incomplete. I have no eyes yet I see. You can see and see right through me. My largest part is one fourth of what I once was.
I move without wings Between silken string I leave as you find My substance behind.
What is full of holes but still holds water?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?