Most "bigger breast" mods for The Sims 4 are implemented through custom body sliders
After cross-referencing community forums (Reddit, Mod The Sims, The Sims Resource), the mod most directly aligned with the query is:
Why does this happen? EA clothing is rigged to the default body mesh. When you increase breast size significantly, the clothing doesn’t automatically stretch. sims 4 bigger breasts mod
Q: Do these mods work with WickedWhims or WonderfulWhims? A: Yes. Most are fully compatible. In fact, WickedWhims has its own breast physics system that sometimes overrides Necrodog’s mod. Check the WW settings to disable "Body Physics" if you use a standalone mod.
A defining feature of modern breast modification mods is the introduction of "breast physics" (often referred to as "jiggle bones" or "bbounce"). Most "bigger breast" mods for The Sims 4
Static size is one thing; watching your Sim walk is another. Necrodog’s script mod introduces dynamic jiggle physics.
Problem: The breasts stick out through shirts or dresses. Solution: Unfortunately, maxis clothing is rigged for maxis bodies. You need to download "Morph Enabled" clothing from creators like Trillyke or Serenity. Alternatively, use smaller breasts when wearing tight EA tops. When you increase breast size significantly, the clothing
Presets are "one-piece" body shapes you can apply instantly to a Sim.
The best results often come from combining both: a high-quality body preset for the foundation, plus sliders for fine-tuning.