i think its just for parda coz she is wearing a hijab too. but agar itna parda tha... tu why put the pics on the net. :S
She is wearing a turtleneck to cover her neck because she's a hijabi. Some hijabis might show hair/neck or w/e on their wedding day but alot of them choose to keep it all covered. My cousin did the same, she had a piece of cloth covering every inch of her hair under the bridal dupatta and she had a red cloth inside the shirt to cover up her entire neck. The only thing she showed was her face and her hands. She doesn't do abaya but she said these are the ettiquetes and purpose of hijab.. which is to cover everything especially if the wedding is a mixed gathering. And despite of all that, she looked absolutely gorgeous!