Nursing with the WHOLE BOOB out

I’m not shy about nursing in public. After nursing 3 kids for a combined total of 4 1/2 years, I have no problem nursing where and when I need to

BUT

My son is making things a bit more difficult for me. He has to have the WHOLE BOOB out to nurse. If my nursing bra or clothing slide up at all, he angrily rips them back down. I used to do the 2 shirt method and he just gets so upset when I do that. I know it’s not a huge deal but it’s just not comfortable for me to be sitting in a dr office waiting room with multiple people gawking at my boob

How can I convince him to boob feed with just the nipple out 😂 and no pumping ahead and bottle feeding isn’t an option.

Tia!