All products are gender neutral. The best way to ensure you like the fit of the garment is to measure your favourite similar garment and see which size is closest in the charts below. There would not be a cat in hell's chance of me doing this personally, and if you're in the same boat, my advice is this:
If you're a man, size up one from what you think you need. The sizes are gender neutral but sweats in particular are not overly generous.
If you're a woman, approx dress sizes are as follows:
Small - 8-10
Medium - 12ish
Large - 14-16
X-large - 18ish
Anyway, for those of you who like a chart...coming very soon!