The loose-fitting sac around the heart is called the pericardium, which is lined by a membrane known as the serous pericardium. This serous membrane consists of two layers: the visceral layer, which is in contact with the heart, and the parietal layer, which forms the outer wall of the pericardial sac. Between these layers is the pericardial cavity, which contains a small amount of fluid that helps reduce friction during heartbeats.
The tissue forming a loosely fitting "sack" around the heart is known as the pericardium. The musculature of the heart itself, consisting of "cardiac" muscle fibers, is, in general, referred to as the myocardium.
Jodhpurs
I bought a nice, loose shirt to wear to bed.
Loose arab garments
social studies
Your belly band, or any loose fitting clothes around your belly.
Habit
They wear very loose fitting clothing.
shift
Wear black, loose fitting clothing. Not too loose or it will look sloppy.
Coulottes
a haik