Without a doubt, flats look perfect with any tunic top. With dresses too, it is ideal for keeping the look simple, thus closed shoes and flats, as per your choice work pretty great. It is important to remember to keep the focus on your outfit. Hence, shoes and accessories are best left to a minimum. However, when you consider a party wear outfit, you can also wear the look with nice heels. Boots are also an excellent option. This also means considering the style of the tunic shirt before deciding on footwear.