Mask Choices

Working as a temp results in a variety of mask choices. Obviously, the N95 is the top line, however, the KN95 is the one I find in some of the offices in which I temp. The most common is the level 3 surgical masks. What is your opinion about wearing a level 3 mask under the face shield? Cover it with a level 2 that is changed after each patient while retaining the level 3? Wearing two level 3\'s and changing the outer mask? Take your own KN95 (that gets costly). Also, disposable gowns- remove and change after each patient or remove at the end of the day? Thank you