You need to feel comfortable yourself. It's completely fine if a chubby girl wears a 2 piece but I find it only looks weird when they don't feel good in it and are then awkward and keep trying to cover themselves up
I know this is going to sound rude, but it depends on how chubby you are. A little bit/ to moderately chubby it looks good and cute. But if you are quite obese, its not as good look in my opinion. But overall, wear what makes you comfortable and happy.
I'm a "soft" girl too, I call it soft not chubby lol And it actually looks really good on some woman and it looks even better when you're confident enough to wear whatever you want despite it and honestly some guys really love it too, so I say go for it.