Overlays are found in the "Skin Details" section of CAS (usually under the face or body paint categories). They sit on top of your current skin tone.
Frequently releases detailed skins on The Sims Resource that lean toward the Alpha style, perfect for players seeking realistic textures in unnatural hues. sims 4 cc unnatural skin tones
Townies walking by would stop and glitch, turning to stare at the glowing green girl on the balcony. Overlays are found in the "Skin Details" section
Non-default CC adds new color swatches to the skin tone picker without deleting the original Maxis colors. You can have a family with natural human tones and one child born with mint green skin. sims 4 cc unnatural skin tones