I know my only "must have" in sport clothing is a good sport bra. Without it, forget it, I'm out of the race. I bought mine in a Winners, because every specialized sport shop was just too expensive, and it's not the kind of thing I really wanted to buy online. I wanted to buy a sweater for jogging outside in the winter months, and my criteria were Fabric (warm but light, and suitable for cooling down rapidly the sweat etc), color (flashy, preferably with reflective stripes to run in the dark) and design (preferably pretty or at least neutral). I never quite found what I liked from sports shops; online has more choice, and more sales.