Ok, not what I thought:
https://www.researchgate.net/publication/236040220_Resource_Security_Impacts_Men's_Female_Breast_Size_Preferences
It's more that poor men favour larger breasts
"In the first instance, it has been reported that larger breasts are preferred by men pursuing low-commitment, transient sexual relationships [28] and holding stronger sexist attitudes [30]." Sounds typical for high test to me
"In this view, men in situations marked by resource insecurity or uncertainty will be expected to idealise larger female breasts, as large size would be an honest signal of access to resources, so long as the amount of fat is not so great as to detract from an appearance of high reproductive value or be maladaptive."