I feel that this dress is something that Stella would wear. Blanche has a much more gamorous taste, but Stella would wear something plain and basic like this. This symbolizes the fact that Stella is more comfortable with who she really is and her economic level than Blanche is or ever will be. She doesn't need to hide herself behind fancy clothing.
Vintage 1950s Dress / 50s Cotton Dress / French Blue Polka Dot Dress w/ Bow S/M