While you may use a two piece suit on the track, they are generally regarded as street gear.  The Fieldsheer Radar 2 Piece suit is a good example of a leather suit that contains some street oriented features.  Pockets.  It actually has pockets.  It's not as street oriented as a textile suit, but being primarily constructed of leather, it offers more protection.  The suit is also heavily perforated which makes it ideal for hot climates.  In a solid leather suit I'm comfortable down to 40 degrees F.  With the highly perforated Radar suit, my comfort level is 50 degrees F.  On really hot days, it's much nicer than solid leather. 

I only have three minor complaints with the suit.  One, the sizing of the suit is a bit odd.  For this test I weighed in at 220lbs, 6' 1" height, 48" chest, 36" waist and 34" inseam.  I went with the XL size or 46 according to the Fieldsheer sizing chart. According to the chart, 48-50 chest, 33-34 sleave, 40-42 waist and 32.5 inseam.  The waist on this suit is huge.  If I don't wear the jacket, the pants will not stay up.  There is also no way to cinch down the pants to fit my waist.  This is a suit for somebody with a big belly.  The chest on the suit is actually a bit snug, but not uncomfortably so.  The legs and arms a bit snug, but only as snug as they should be.  The rest of the suit fits wonderfully.  My second complaint is the zipper that attaches the jacket to the pants is a slight bit finicky.  It took me about 10 minutes the first time I tried to connect it.  But now that I'm used to it, I can get it connected right away.  Only occasionally do I not hold the zipper at the perfect angle to attache the two.  My third complaint is that the collar has a really large diameter.  It does not come anywhere near my neck.  It doesn't cause any problems, however I've had bugs fly straight into my leathers through the neck opening.