McHenry Men's Wrinkle Free Polyester Blended Stretchable Self Design Formal Regular Fit Trousers

Can I replace with different size?

Is it 4 way stretch pant?

Size 42=42 or 42=43

Currently i am wearing 36 inches pant from regular brands. your pant waist is stretchable? do i need 34 or 36 inches?