Best and less and bonds have them.
I have ones up to a size 4 from both.

Best & Less sells Bonds onesies till size 3

Try online – you can find anything with some smart googling. Amazon and Ebay are good places to start.

i would try target australia

There is a site called:

Outlet shop for kids

It’s genuine and fantastic, you can pay by paypal! Sign up to this they have massive bonds sales like every other month. You can get zip onsies there for about $9ea. The press stuf ones are generally about $7ea
Great quality and a fraction of their normal price!

Bonds have onesies in size 28months (2yrs). If you shop the outlet store or sales they price isn’t too bad

Kmart had them last time I checked, though that was a while ago. Best & Less might have them too, or Target? Good luck!

Kmart, cotton on, Coles, target. They don’t have big range but I’ve seen them.

Are you serious? There’s onesies everywhere nowadays, in all sizes, from baby to adult sizes. I have to say, an adult onesie is the ugliest piece of clothing I’ve ever seen!

I buy my son (also 2 years old) onesies from BigW
They go from size 1-8 I think.
My boy is now in a size 3-4, and they always have them in stock.

Big W definitely have bigger sized onesies. Also, best and less have some pretty good and cheap ones too.

Big W, Target and Kmart all have bigger onesies.

Big w have some beautiful warm onesies I brought some for my son in size 3 form there and they are good quality

I got mine from Kmart, Big W, Target, and Coles Mix. Hope that helps

Different brands as you would know have different sizing, some online shops have bigger onesies. Bonds go up to 2 which you can get from woolies or coles.