So, details were texted on Tuesday morning, and I met my mother that morning to collect the fabric. However, on reading her notes I realised that the dresses were not needed for the middle of May, but actally for that weekend coming (20th/21st April).
Panic stations for a bit, then I started to work.
I had to draft patterns for the same dress for a 2 year old and 4 year old, using the little sketch I'd received. Cut out the pieces, sewed them all up, lined the dresses.
Just hope they fit!