I don't really have a specific style when it comes to my pastel outfits. I take a lot of inspiration from j-fashion, but I do not typically follow a particular style.

airy or soft textures (knits, lightweight fabrics, peignors, etc.)
cute and/or childlike prints and patterns
feminine silhouette (for the most part)
novelty earrings and accesories (the more out there the better)
primairly cool-toned pastel colors, such as cool-toned pink, blue, mint, and purple
Fairy Kei
Decora
Cult Party Kei
Grandma/Grandpa Fashion