The idiomatic expression "to get a little fancy" means to add some extra touches or details in order to make something more impressive, elaborate, or decorative. Full definition
So today I am getting a little fancy with this cute date night outfit! (upbeatsoles.com)
I also got a little fancy and added some fresh herbs to my whipped cream cheese. (halfbakedharvest.com)
When it comes to the holidays, sometimes I love getting a little fancy, but generally I tend to stick to casual and comfortable. (middleofsomewhereblog.com)