Where does this title come from...
The Shoe that fits?

Dear Nimmy, 

"Shoes that fit" is a non-profit organisation that provides shoes to
children in need
<http://en.wikipedia.org/wiki/Shoes_That_Fit> 

If you meant, what is the origin of this phrase, one can assume that
the legend of cinderella is responsible:
<http://en.wikipedia.org/wiki/Cinderella> 

However, you can see here a discussion on the etymology of the phrase: 
Phrases.org.uk
<http://www.phrases.org.uk/bulletin_board/7/messages/845.html> 

I hope this answers your question. Please contact me if you need any
further clarification on this answer before you rate it.