A lot of people have the misconception that wool is a very warm fabric. That is true to a certain extent, but not entirely. Finely woven pure wool is actually a wonderfully light and soft fabric. Because it is 100% natural, it is also very breathable.
A typical weight for Super 120's pure wool is around 280g/m. In comparison, denim is usually over 320g/m. Very technical stuff here, but what I'm trying to say is that if you can wear jeans in our weather, you can wear pure wool.
Pure wool is expensive stuff, but you pay for what you get.
Fabrics that are too soft can sometimes feel a little feminine. One of the great things about wool is that while it is soft and light, it retains a certain structure in it, providing excellent hang in the legs. When given a good ironing, ideally with just a dose of spray starch, you will achieve that paper-thin and well-defined crease down the centre.
You'll notice I didn't say a thing about polyester pants. Because there's nothing sexy about plastic.
Wearing these are not gonna score you any points with the ladies.