The WHO advocates against the creative usage of face masks:
A face mask shouldn’t be worn under the chin, where sweat and dirt also ends. If you are in a bar having a drink, just keep the mask in your hand making sure to hold it by the earloops. Do wash your hands before putting the mask back on.
To take your mask temporarily off, do not store it over the elbow nor hang it to your ear; that would expose the inner side to dirt. There’s also the risk that the mask falls to the ground. In such a case do not put your mask back on.