For all the t-boys / transmen out there looking for no bulge or flat chest items. Briefs, shorts etc.
Here're some places I know of.
As of Dec 2021
At Noche,
http://maps.secondlife.com/secondlife/Beach Bay/190/199/2505
https://marketplace.secondlife.com/stores/139359
look for items that have B0 that is B zero size for no bulge in the DEMO, be aware of the avi type.
At Two-Sided
http://maps.secondlife.com/secondlife/Pure Love/144/226/31
https://marketplace.secondlife.com/stores/174439
there are no bulge items and also femboys gear.
At Cubura (used to have for Jai briefs - in HUD, Bulge ON/OFF option)
http://maps.secondlife.com/secondlife/Pure Love/126/117/26
https://marketplace.secondlife.com/stores/170714
no bulge items for Jake, Legacy, Enzo.