Do yourself up
Definition 1 of 2
Pro Tip 1/3Special Occasions
Used when preparing for events where appearance matters more than usual. 
He is going to do himself up for the award ceremony.
Pro Tip 2/3Impression Matters
Suggests an attempt to make a good impression through one's appearance. 
She did herself up before meeting her fiance's parents.
Pro Tip 3/3Detailed Preparation
Emphasizes attention to detail in dressing or grooming. 
For her first date, she did herself up with great care.