![1girl arm_ribbon bare_shoulders barefoot black_hair blue_bow blue_eyes blue_ribbon blush bow bowtie breasts cleavage cleavage_cutout collarbone covered_nipples dark_skin dress dungeon_ni_deai_wo_motomeru_no_wa_machigatteiru_darou_ka embarrassed gloves hair_ornament hair_ribbon hestia_(danmachi) large_breasts long_hair on_bed panties pencil_dress rei_no_himo ribbon satou_kuuki seiza short_dress sitting sleeveless sleeveless_dress smile solo twintails twitter_username underwear white_dress white_gloves white_panties rating:q score:12 post #1977572](/cdn_image/preview/06/f1/06f15ea2d184c45a9358b81868721421.jpg)
A pencil dress is a slim-fitting dress with a straight, narrow cut. Generally the hemline ranges from skirt length to miniskirt length, and is tailored for a close fit.
Hestia's white dress is an example of this, due to the skirt portion of her dress fitting tightly around/below her hips.