Refers to any upper-body article of clothing (i.e., blouse, t-shirt, nightgown, etc.) that has sufficient "excess looseness" in front of the wearer to allow someone's else's head to be tucked up in underneath so that said person can snuggle his/her head against the wearer's bare chest without the garment's having to be removed.
Snuggly guy: I love how Tiffany wears such a loose PJ top to bed; it's a really awesome "max headroom garment", in that I can easily slip my head underneath the hem and nuzzle up to her boobs while we sleep, even when it's too chilly in the bedroom for her to sleep "topless".
by QuacksO June 21, 2017