When I was wee many little girls used to wear round hair clips, usually in a brown colour - tortoiseshell or checked - or sometimes in a pink gingham colour.
They clipped rather than slid in.
I'm desperate to find some, all usual places (boots, amazon, poundshop) drawn a blank.
I think my best bet is a traditional pharmacy that carries more dated stock. I keep looking!
If anybody finds these hairclips when out and about, please send me them and I will more than repay the favour :)