I can’t tell from that image whether you’ve selected those items in the list or not.
From the Django shell:
- Get an instance of Cart
(e.g.cart = Cart.objects.get(pk=<the pk you know having suits assigned to it>) - Print the related objects:
(e.g.print(cart.two_piece_suits.all())
What’s the output?
If you don’t see the entries you expect, then you have not assigned the suits to the cart.
It may also be worth your time to review the relevant docs: