It would have came with a holster...........and for a 1944 gun more than likely it would have had a rubberized clamshell holster.
Holster would have a cleaning rod, a small cleaning rag inside the spare ammo compartment, perhaps a spare box of ammo. It could have a spare magazine as well.
Pistol would have a lanyard installed on it.
Now if you want to purchase "original" accessories, the prices are going to add up fast, a decent rubberized holster can be bought for around 175/200 on line, cleaning rods, probably 50-60. You might not find a real lanyard, and if you do it will be more expensive than the holster as they are hard to find. Spare magazines run a little over 100 each.
Now if you wanted some "reproduction" accessories a leather holster will be 40/50, cleaning rod, 15, lanyard 20/25. Repro ammo packet, 15/20.