I can definitely create a color palette inspired by casual ballerina workout/practice clothes with soft yet vibrant colors. Here is a suggested palette for you:

{
  "palette_name": "Casual Ballerina Workout",
  "colors": [
    {
      "name": "Soft Blush Pink",
      "hex_code": "
                            
                            #F2C6D4
                        "
    },
    {
      "name": "Lavender Mist",
      "hex_code": "
                            
                            #E6D6E8
                        "
    },
    {
      "name": "Mint Green",
      "hex_code": "
                            
                            #A8E0D4
                        "
    }
  ]
}

This palette features soft pink, lavender, and mint green, which are perfect for a casual ballerina theme while still being lively.

Would you like any adjustments to the colors or additional options?