The neckline made the dress, imo. I thought it was lovely and I thought Pippa's dress, with the same basic neckline shape and same colour, was completely appropriate as the rest of it was plain, and the top not tight or too revealing.
The hair and shape of the dress said 'morning wedding', and Pippa's flattered her while still being plain and imo unobtrusive. I liked the Middleton family's style. Mrs M looked good, I thought. Very well thought out ensemble. PM's wife could learn a lesson there.
10/10 for 'appropriateness' and a sort of sweet style as exemplified by the simple veil and tiara. If she chose the tiara, she picked the right one. Agree with 'understated and traditional' -- I think she honoured the occasion.
Felt sorry for the York gals.