Hi intozlight. We really deliberated over whether or not to extend the deadline, in the interest of being fair. And I certainly don't want you to feel disappointed. Most of the feedback we have receive has been in favor of the extension. We think limiting the extension to one week, as compared to a longer period of time, will keep it fair for everyone.
Besides that, I think your entry is great. I know that the fact that you didn't get a chance to use antron fleece will not hurt your entry in any way. Most of the entries have used other materials - polar fleece, furry fleece, fur, etc. One even used the material from a velour blanket. The use of antron fleece will definitely not be a deciding factor for the judges.