New York Post Composite Women have had enough of tight undergarments, and they’re finally doing something about it. That’s right — hundreds of shoppers say they’ve ditched their stiff, pokey bras for something a little more forgiving: a tank with a wireless built-in bra that’s comfy, flattering and still socially acceptable to wear outside the house. Even better? It’s marked down to just $20 on Amazon , comes in a sea of colors and has racked up nearly 50,000 glowing customer reviews. “It’s not a stiff gross material,” one reviewer emphasized. “It is very soft and comfortable and helps keep the girls in place decently for low or mid-level workouts. It could most definitely be worn out.” Beyond the breathable material and stylish cut, she says there’s another reason this top has become the first thing she reaches for in her closet.…