I am going to tak eup karate this thursday. can someone please tell me what do I wear inside before I put on my qi. I am a female and I am wondering i...

I am going to tak eup karate this thursday. can someone please tell me what do I wear inside before I put on my qi. I am a female and I am wondering if I need to wear a t-shirt inside?
If I don’t weat a layer of shirt inside, what if my qi suddenly loosen and came off?

Thanks for helping me to overcome this fear

Next comment: "I wear a sports bra under my gi. Black [...]"
Previous comment: "heavy cotton sounds okay, but canvas sou [...]"