I just thought id say soemthing: unless you have ankle high sneakers/joggers/runners whatever they are called in your area of the world I wouldnt recommend wearing them for riding especially if you are just learning to ride. If your foot goes forward in the stirrup it is quite easy for the laces to get stuck in front of the stirrup. If you come off like this you will likely get your foot caught in the stirrup.
Don't stress too much about what you wear. Just wear something comfortable and that you have freedom of movement in. If you get into showing or something eventually then you can work in the finer aspects of dress but for now just enjoy it :)