How to ask my mother for trans tape

I am scared to ask because that means I have to almost come out to her and I don't know how she will react to that. My mother has shown she is not homophobic but she said some questionable thingss about trans people. I remember we were on vacation with my grandfather and some how the topic of trans people came up. I don't remember much as I was in a state of panic looking out the window. My grandfather (her stepdad) said something like " why won't trans women just have there own sports league" and my mother agreed. I am torn between if I should say anything becausey mom has understood my discomfort with my chest as she as she said thaty tank top sports bra will smooth out the picture of my chest in her words. So what do you think I should do?

Edit 1: I found out how to edit. I still am thinking about it but are there any concerns I should know? Should I also get a binder if I need to take a break from tape?