A gathered frock for kids with an asymmetrical neckline and sleeveless design in white and blue would be absolutely charming! Here's a detailed description of such a frock:

Color Scheme: The frock could feature a combination of white and various shades of blue, such as sky blue, pastel blue, or navy blue. This color palette evokes a sense of freshness and serenity.

Fabric: Opt for lightweight and breathable fabrics such as cotton or linen, which are ideal for children's clothing, ensuring comfort and ease of movement. The main body of the frock could be in white, while the accents or detailing could be in shades of blue.

Asymmetrical Neckline: The frock could have a unique and stylish asymmetrical neckline, adding visual interest and sophistication to the design. For example, one shoulder could feature a wider strap or ruffle detail, while the other side could have a thinner or off-the-shoulder style.

Gathered Design: Incorporate a gathered waistline to add fullness and create a flattering silhouette. The gathered waist can be adorned with a coordinating fabric belt or bow in a shade of blue to accentuate the waist and add a pop of color.

Sleeveless Design: A sleeveless design is perfect for warmer weather or indoor events, allowing freedom of movement while keeping the child cool and comfortable. You could add subtle ruffle or lace detailing along the edges of the sleeves for a touch of femininity.

Details: Consider adding delicate embellishments such as floral appliqués, embroidery, or sequins in shades of blue to enhance the overall elegance of the frock. These details can be strategically placed along the neckline, waistline, or hem for a polished look.

Overall, a gathered frock for kids with an asymmetrical neckline and sleeveless design in white and blue would be a beautiful and stylish choice for any special occasion or casual outing.