when will I start to need maternity clothes?

I'm 20 weeks and I'm using maternity jeans and shorts lol depends I guess

Everyone shows different. I did at 12 weeks

depends on your body I'm 18 weeks and wearing full panel maternity pants because my belly isn't uncomfortable with anything else

I started wearing them around 19 weeks with my son but at 9 weeks now because I'm having twins

example of difference, I wore my regular jeans comfortably until 35 weeks

Another example I'm 36 weeks and still wearing my regular clothes. Although those jeans are gathering dust in favor of yoga pants lol