May I never find myself in that situation.
I’d normally call them “tights”, but they are often referred to as “spats” in MMA/no-gi BJJ - at least in advertising.
I think “tights” is used more broadly in the US. Outside this product, “spats” means the same thing here as there.Tights are what ladies wear with dresses and skirts. To be tights they'd need to have feet. Leggings don't have feet. I imagine Americans like to call things differently. Spats ( short for spatterguards) are overshoes worn to protect shoes. If you watch Scottish pipe bands they wear them.
Tights
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spats
leggings