So, these are a thing.
They’re Bluetooth-enabled gloves wherein the left glove features a call button in a patch on the wrist (that one you see in the photo that says “hi-Fun”, a speaker in the thumb, and a microphone in the pinky.
You can leave your phone in your pocket (not as shown) and take calls by pushing the wrist button and then literally talking to the hand (while making the universal “phone call” hand gesture).
You can buy them here. Prices range from $39 to $65.