From this
https://www.britishpathe.com/video/s...le-like-father it appears that in training they wore "fatigues" Khaki Drill without colalr badges and the polo pattern helmet (in this case appears to be the Canadian Hawley version) and Frocks, Khaki Drill, with collar badges for parade. Officers appear to wear four pocket drab Jackets, Service Dress with Caps, SD and the interetsingly the YTB badges. I was expecting the officers to wear Instructional Corps or regimental badges actually but they do seem to have worn YTB torches as well.