How many black cashmere sweaters does one need? Retirement Yenta is up to 10 and it still doesn’t seem like enough. This clothing item is a staple for all occasions and climates. What if you’re sitting out on the patio of your Miami Beach condo and a cool breeze blows up? Oy! At least you’ve got a nice warm sweater to throw over your shoulders. Retirement Yenta recommends the Brooks Brothers‘ men’s cashmere v-neck sweater.