There's a pretty white silk dress in the Special Occasions section on the Gymboree website $84. Check J Crew too.
I think the whole miniature wedding dress thing seems strange. My mom made my dress, white eyelet cotton. Wonder if she has it packed away somewhere.
The faith formation director at our parish said last week at the parent meeting that they don't have to have a white dress, but if you look at the photos from previous years, everyone does. Maybe we'll be the odd ones out when my girls are old enough (this year is my son's turn).