Sportscoats are typically made from a heavier wool, often with some texture or pattern in the weave. In general, they are made in busier fabrics.
Style purists will argue that sportscoats should never be made out of suiting fabric, as a sportscoat is not a suit jacket. You can tell them go feck off and do whatever you want, it’s your jacket.
However, making Jaeger is going to take some time. Do yourself a favour and get something nice for the final project. (because you will be making a muslin, right?)