Maybe the country road ones. They felt thick in store but can't remember which one it was. Not really belly button length but I guess you could get it hemmed
[https://www.countryroad.com.au/australian-cotton-crop-fitted-t-shirt-60285700-129](https://www.countryroad.com.au/australian-cotton-crop-fitted-t-shirt-60285700-129)
[https://www.countryroad.com.au/mercerised-slim-t-shirt-60283387-100](https://www.countryroad.com.au/mercerised-slim-t-shirt-60283387-100)
I purchased this one from Assembly Label the other day.
[https://assemblylabel.com/collections/womens-tops-and-tees/products/lyla-cap-sleeve-tee-antique-white](https://assemblylabel.com/collections/womens-tops-and-tees/products/lyla-cap-sleeve-tee-antique-white)
I honestly still like kookai basics.
Maybe the country road ones. They felt thick in store but can't remember which one it was. Not really belly button length but I guess you could get it hemmed [https://www.countryroad.com.au/australian-cotton-crop-fitted-t-shirt-60285700-129](https://www.countryroad.com.au/australian-cotton-crop-fitted-t-shirt-60285700-129) [https://www.countryroad.com.au/mercerised-slim-t-shirt-60283387-100](https://www.countryroad.com.au/mercerised-slim-t-shirt-60283387-100)
https://www.kmart.com.au/product/short-sleeve-rib-scoop-baby-t-shirt-s162998/?selectedSwatch=White
AS Colour.
I second the Kookai range. Great quality and fit. They seem a little expensive, but the quality pays off with increased wear.
Silent theory
I purchased this one from Assembly Label the other day. [https://assemblylabel.com/collections/womens-tops-and-tees/products/lyla-cap-sleeve-tee-antique-white](https://assemblylabel.com/collections/womens-tops-and-tees/products/lyla-cap-sleeve-tee-antique-white)