I had a look at the listings for toddler's plush costumes.

I think people are wary of your zero percentage for starters.

I also think you are too cheap in comparison to others.  Another alarm bell

for wary buyers. (What's wrong with them/seller)

My advice would be to put the price UP $15 and offer free postage like

the other sellers.

But, yes, warm weather would have a lot to do withh it.