Please Help Settle a Debate

My daughter, niece and I have had this debate going on for some time, and I would like clarification. I recently purchased the long Kaftan. I like to wear them around the house, they are so comfortable! Both girls say they are moo moos, but I remember moo moos as the sleeveless short dress below. So what do you say? Are they both moo moos? I see a big difference myself.