There was a very famous BA cabin crew known as The Gypsy. He spent his entire, very long, career without ever having a suitcase. This in the days of 21 day trips which often could become 25 days.
He had a very small cabin bag which supposedly contained flip flops, t shirt, one pair trousers, one spare underpants and toiletries.
Uniform shirt would be ‘laundered’ in hotel room.
As you can imagine he was not the best dressed person down route!