100% Poplin Dacron Suits! Poplin Dacron is usually compared with wool suits. To make it simple. Poplin is usually associated with spring and summer suits, while wool is mostly associated with fall and winter business attire. There's no right or wrong, but poplin is much more comfortable for spring and summer and lightweight. Not a lot of mens stores sell Poplin Dacron suits, Suits Outlets is proud to introduce a wide selection of Poplin Dacron suits at affordable price.