Date : 28 March 1999Characters : Millie Bulstrode , Roger DaviesLocation : Phoenix Bar . Status : Semi - PrivateSummary : Millie goes on a ' date ' . But I ' m not sure he knows that . Completion : IncompleteMillie had dressed in the simple black dress she 'd work to Belladonna when she 'd met Wayne . It was dressy enough , if a bit bland . Still , she was n't sure how hard she should try in the impressing category .
According to the above context, answer the following question.
What may be the reason for Millie wearing a simple black dress on her date ?


Millie was n't sure she wanted to dress to make an impression .