Dark coloured knickers search!

[Dotty342kids]

DD is 11 and started her period about 3mths ago. She seems to have quite heavy periods and often leaks. Whilst she's adjusting to having periods and getting used to managing them, it'd be really great if she could have dark navy / black knickers so that she's less self conscious and embarrassed by the leaks.
But I can't find any, anywhere! Have looked at Next online, and tried Primark and M and S and no luck.
Anyone else seen any, anywhere?

Peacocks do women's pants from size 6. Think I paid £5 for a pack of 5 for my DD.

DD was 11 (by 1 week!) when she started her period and we went for adult sizes - she's tall and we'd already started buying basics like jeans/t-shirts in adult size 8 (often cheaper than trying to buy the same thing in age 14/15/16, and more choice too!)