Suitable Clothes for Horse Riding?

I may be going horse riding again soon, although I don't know, but if I did go again I would obviously have to wear suitable clothing. I already have some riding boots from when I used to ride (my feet grow really slowly LOL), but would a simple polo shirt and sweater/jumper, soft seamless tracksuit bottoms (they're not baggy, but I could tuck them into my boots if needed) and a riding helmet be fine? There's a tack and gear shop near where I live, so I could buy the helmet there but they're expensive, and although I have money, I could only pay for a few lessons a month on the money I have (of course, I can do chores and stuff for extra allowance).

PANTSSSS riding boots and a tshirt that's what I wear.

I go horse riding and I go in these things that look like geans but are tights and they are long and comfy which I love and you do not need some fancy shirt I just were a te-shirt or long sleeve shirt and you will need a riding helmet that is it. Have fun!

For horse riding and any other outdoor activity, it is very important to wear comfortable clothes, the clothes such as Carhartt pants, camouflage pants and drake clothing etc. are best for outdoor activities.