Vislivin Women's Basic Solid Camisole Adjustable Spaghetti Strap Tank Top Black/White/Black/Gray M

I have camis form costco that i love, kirkland brand, but they no longer sell them. they are 95% micro modal and 5% spandex. are these very similar?

Odd way of measuring ...underbust? Like the measurement for the band of a bra? I'd think the actual bust measurement woukd be more accurate...

Are these too long to wear them under shirts? some camis are too long and bunch up when you tuck them in your pants.

How big is a large