help maternity pants

The size ( EU ) to leggings I have over waist is 40which fits good on legs.

but i also I have a 42 leggings which are big.

But as I measured myself on SHEIN on waist size i have 98cm.

What does it mean the range 79-114cm at M(38)

and at L(84-120). I didn’t measured my belly tho only waist but what should I buy ? The M or L as i’m on centimeter 98 at waist. I notice that i don’t like lose pants i want them stay fit now i’m 21w