Clothes start to look glitchy after changing body sliders

Hi. The problem can be either in how breast bone weights transferred or in how the uv_1 transferred. Choose Nearest face interpolated for both

- select all parts of the garment ( select a face, press Ctrl L, choose Material or whatever option will select the whole thing), press P, choose Selection to separate;
- unfold rig, make top visible and selectable ( eye and cursor buttons );
- select top, Shift-select the separated garment, switch to Weight paint, choose Transfer weights and set it like in the pic, then Clean and Limit total. This will give you much smoother transition;

- with your garment selected, add Data transfer and set it up like this