1) Dress all fancily 2) Dress extravagantly 3) Dress in a showy matter 4) Dress ostentatiously 5) Dress to the nines 6) Get dressed in Sunday best 7) Prettify 
Doll up is slang for to adorn or dress oneself or another, especially a child, in a stylish or showy manner.
[v] - use special care in dressing, making-up, etc.
slang for to adorn or dress oneself or another, especially a child, in a stylish or showy manner.
do up verb use special care in dressing, making-up, etc.; `She dolled herself up for the night out with her friends`