Model not mine, all credit goes to novowels:

https://civitai.com/models/2316974/dorothea-arnault-fire-emblem-three-houses-sdxl-lora-or-6-outfits-

Tested at 0.8-1.0 strength.

Clip skip: 1

Contains her academy, Three Hopes, and timeskip appearances, as well as her Fire Emblem Heroes Summer, Plegian, and Winter alts.

• Add "defdt, long hair, wavy hair, brown hair, green eyes, black hat, cabbie hat, earrings, black choker, black jacket, puffy sleeves, long sleeves, cleavage, bracelet, gold trim, black skirt, black thigh boots" for her academy look.

• Add "3hpdt, long hair, braid, forehead, brown hair, green eyes, green earrings, mesh top, red gown, puffy long sleeves, silver underbust, silver bracelet, red skirt, red boots, ankle boots, high heels" for her Three Hopes look.

• Add "tsdt, long hair, parted bangs, brown hair, green eyes, earrings, red dress, frilled dress, off-shoulder dress, black frills, cleavage, silver corset, long sleeves, detached sleeves, frilled sleeves, wide sleeves" for her timeskip look.

• Add "smrdt, long hair, wavy hair, brown hair, green eyes, sun hat, black hat, hat flower, earrings, black choker, two-tone bikini, pink bikini, black bikini, pink bracelet, black sarong, pink sarong, gradient sarong, sandals, pink nails" for Summer Dorothea.

• Add "plegdt, long hair, wavy hair, brown hair, green eyes, feather hair ornament, gold circlet, dancer, neck ring, halterneck, green brooch, criss-cross halter, black bandeau, black bridal gauntlets, gold bracelet, black shawl, red pelvic curtain, black pantyhose, toeless legwear, red nails" for Plegian Dorothea.

• Add "wtdt, long hair, braid, forehead, brown hair, green eyes, holly hair ornament, green choker, star choker, brown top, red dress, fur trim, puffy short sleeves, brown gloves, elbow gloves, gold bracelet, green skirt, fishnet pantyhose, red high heels" for Winter Dorothea.