The round face ones like this-
https://www.masksoflove.org/citizen-mask-pattern.html
Though I've made several of the pleated ones, which are easier for beginners to sew, they don't fit as snugly and can be more irritating to someone not used to wearing a mask.
I made a few changes to the pattern above too....I use craft type of pipe cleaners (chenille sticks) cut to 6" for the bridge of the nose and I make fabric straps because elastic behind the ears doesn't feel too good for any length of time.
Fabric ties also allow for a better fit for more of a variety of face shapes like a long face, or a "fluffy" face. I have quilt batting and other materials for the inner pocket and the mask is all cotton and easy wash/dry.
ETA: I've made several of the rounded ones from different sites and each pattern is just a hair different in the height, or the curve, or the steps involved, and this one is the most comfortable we've found so far. I'm assuming it will be more comfortable for the recipients as well.