Answer:
I am a time for gathering crops. Remove the first three letters and I become an object you can wear.
I am wood that is neither hard straight or crooked
What kind of room has no doors or windows?
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
Canine children.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.