Those are some very nice-looking hose, and I'm sure you'll wear them proudly.
As to what the tops are, I can tell you what they're NOT:
They're not really diced, because dicing is usually done with two colors and a mixture (marl) of those two colors.
They're not Argylls, since they have no rakers (stripes crossing the diamonds).
They're not entrelac, since they don't cross each other.

In short, I think you have some unique hose that will be the envy of everyone who sees them. Please congratulate your dear mother on a job well done.