^ I'm no expert on velour, or tracksuits(!), but I'd say that you could wear it, equally well, all year round.
Velour does add bulk, though, so unless you're very underweight, I'd definitely go for a dark coloured velour (black, dark navy, or burgundy) and also, wear it slightly looser (but not too loose) on the top half of your body (as that should look slightly more flattering if you're bigger at the top and balance out your bottom half, if you're smaller at the top).
Currently, when I'm dressing casually (as often as possible!
) I tend to wear long tops, or knits, with leggings and boots.
Sportswear always seems to lag behind fashion.
I'm still having to wear bootcut track pants for walking my dogs. Even though I wouldn't wear bootcut jeans anymore (no offence to anyone who does!
).
Just had a Google and I think there's a bit of a gap in the market, at the moment, for truly fashionable looking sportswear.