I thought Pippa looked nice but the dress was very similar to Kate's. Her hair on the other hand looks amazing and really suits her.
Kate's dress makes her look matronly (I agree that the top gives a saggy impression). I suspect she deliberately didn't want to upstage her sister.
I thought it was funny that there's loads of pics of Kate with the kids outside (where the media's gathered), but a nanny appeared to be waiting at the church door so Kate could hand them over as soon as she stepped inside!