Panties

Panties are a pretty common element in anime character art, often being indicative of a certain look or personality quirk. You'll notice that there's a range of styles, from the traditional shimapan stripes to more intricate lacework that shows the artist's attention to detail. It's a pretty common look in anime, especially in more fanservice-oriented series, that adds a certain playful quality to the character's design. The artwork itself tends to have nice lighting effects and lines to show off the different fabrics. You'll also notice that they're often paired with more casual wear or school uniforms, which adds to the candid quality people love in their character art. To be honest, the soft colors or patterns make for pretty good lockscreens.