Page Six may be compensated and/or receive an affiliate commission if you click or buy through our links. Featured pricing is subject to change. Autumn’s calling, and Bethenny Frankel has answered. The “RHONY” legend recently took to Instagram to share her fall go-tos, and one stand-out essential she name-checked is a $50 cool-weather hero: Quince’s Mongolian Cashmere Crewneck Sweater. She captioned the Story, “Wearing on repeat … a staple” — and shoppers couldn’t agree more that it’s a wardrobe must-have. The cozy top has racked up almost 36,000 reviews on the direct-to-consumer website and has a near-perfect rating. The “Just B”…