Maternity leggings

I’m looking to invest in some maternity leggings with support. It’s probably going to be the only pair I buy. They’re to wear to work under dresses and with long sweaters. I’m a teacher so I prefer they aren’t see through or super thin. I’ve been looking but I’ve never bought any before! So I have no idea what brand is good. I’ve looked at the Blanqi ones but they’re pricy. I’m willing to pay if it’s worth it.