I'm in the same position as you, newly qualified, doing youth football, and just sent my 6 matches in a while back. I wear a tracksuit. Some regular trackie' bottoms, and a RA fleece tracksuit top. That's when I go and talk to the managers, check the pitch etc. Then, I go back to my car, and take the trackies' off, have my kit on underneath, and then go and do my warm up... Last weekend I saw a ref turn up for the pitch next to me with his full kit on, 2 flags in hand, and that was it. A few weeks ago when I was playing, our ref turned up, minutes to K.O (we were waiting for him to turn up!), came and had a word with us, the same with his kit on and 2 flags in hand, and kicked off! So, if I was you, I'd buy a top from somewhere (that shows your the ref, most people at matches recognise me before the match because of my jacket), and just wear some regular tracksuit bottoms for the minute. You can buy an FA Polo though, I'll see if I can find it, because I've seen them before. Hope this helps.