I have an Aeronaut and a Tri-Star (well, my husband has "borrowed" the TS!). Neither comes with a garment bag and I am not sure whether any garment bag would fit either. I would say that the TS's compartments are slightly better than the Aeronaut's for packing a suit coat. The Aeronaut's central compartment is not as long as the full length of the bag, because of the end compartments, so it has a square (cuboid) rather than rectangular packing volume. I think both bags would require you to fold the jacket horizontally. However, if you search this sub-forum you should find some good threads on folding techniques that IME are effective at minimising creasing.