IMHO Mabel's choices are like a desparate cry for attention. Whereas Laurentien has a quirky personality and fashion-sense throughout her life and career as a princess, Mabel seems to intentionally choose when she is going to pull one of these complete f***ups. This wedding, the red fringe thing at Harald's birthday, and several other high profile events where she seems to have one mission - be the one most talked about. Well, mission accomplished, Mabel.
Laurentien, for her quirkiness, actually has a personal style. It may not always be to everyone's taste, but for the most part it is appropriate. The torpedo-boob thing at Frederik & Mary's wedding was a nightmare, but with the correct bra and correct fit, it would have just been unusual and regardless it was still appropriate to the occassion.
Her gown yesterday, I actually kind of liked. It fit her personality, stood out without screaming "LOOK AT ME!!!" and was definitely appropriate for an international state event in a religious venue.
Mabel must really have self-esteem issues, knowing that she married the least popular son of Beatrix, had her own appropriateness issues with her past, IMO is the least attractive of the dinlaws, and having Maxima as crown princess who usually gets it right. Mabel's inferiority complex needs to improve or she needs to be excluded from representing the Netherlands at high-profile events. She is an embarassment to the monarchy and the country.
Better yet, they should throw a huge birthday party/anniversary for her and then everyone send their chief of laundry and household cleaning as representatives...all wearing cut-off jeans, wife-beaters, tube tops, and flip-flops. Wait...scratch that...Mabel would fit right in.