The only left handed cutters and sewers I know have adapted to using their right hands for cutting, using what’s available.

However, what you’re asking for is “True Left Handed” or “Reverse Bladed” dressmaking shears.

I’m pretty sure Kai reverses the blades on their left handed versions, at least they do of the higher end models (7000-series Professional models). Here’s a quick Amazon search of some 10”er’s