It looks like you're new here. If you want to get involved, click one of these buttons!
Being on and off runner I started to run in track pants. Then I got a bit more serious I bought long tights for cool weather and then I noticed that when I ran in track pants I was always slower than in tights. The difference is about 10 sec/km (I'm slow, I usually run between 5.30-6.00 min/km).
A week ago I did three runs on the same course and in the same weather, two in tights and one in track pants. Indeed, the pace was 10-12 sec slower in track pants and they feel less comfortable.