What’s the difference between wrestling in shorts and t shirt vs wrestling in a singlet

How big of a difference is it really between wrestling in workout clothes like shorts and a t shirt, compared to wrestling in a singlet? I’m newer to wrestling and have been going to practice in a t-shirt and shorts, but will be competing soon and was wondering if it’s gonna throw me off if my first time wrestling in a competition is in a piece of clothing I haven’t wrestled in before. I also haven’t wrestled an opponent in a singlet yet, so I guess I’m wondering if that’s a big difference too in terms of getting solid control of your opponent, and if it’s worth trying ahead of time. Any advice is welcome.