1)i think that the register number thing is good.i mean,in a class of fourty,i'm sure that some would fall for the same number.so this prevents FIGHTING.
2)class tee with sleeves are nice,and i prefer it with sleeves la,but it is weird if you gonna use the design of a jersy and use sleeves you know??... i dunno la.

these are just ideas.
comment if you want.
cause in the end,you are the ones wearing the shirt.
if you dun like the design,give your own one la,then we'll decide AS A CLASS.