To use:

1. In the folder {Trails in the Sky 1st Chapter}/pac/steam/, unpack the following files:
asset_common_model.pac
asset_common_model_info.pac
image.pac
table_en.pac (or the language of your choice)

2. Place the unpacked "asset" and "table_en" folders in the root {Trails in the Sky 1st Chapter}/ folder (same folder with sora_1st.exe in it).  The default location for Steam is {Steam}/steamapps/common/Trails in the Sky 1st Chapter.

3. Copy the contents the assets folder in the mod into your root {Trails in the Sky 1st Chapter}/ folder.

4a. If playing in English, in the v1.05 version of the game, without any other mods to combine - Copy the contents the table_en folder in the mod into your root {Trails in the Sky 1st Chapter}/ folder.

- OR -

4b. If combining mods, playing in a different language, or with newer tables - Copy the .kurodlc.json file an empty folder along with the original versions of t_costume.tbl, t_dlc.tbl, t_item.tbl, t_name.tbl and t_shop.tbl table folder, and run kurodlc_make_tbls.exe - included, but newest version available at https://github.com/eArmada8/kuro_dlc_tool/releases - DO NOT run in the table_en folder itself, because it will attempt to modify other tables for which the schema is not compatible, and the game will refuse to load.

5. Once you have installed the mod, the costumes are available for purchase in:
Rolent: Rinon's General Goods
Bose: Paul Elk
Ruan: O'Neil Duty-Free Shop
Zeiss: Bell Station
Grancel: Dept. Store - Accessory Shop

I own none of these assets, I just did the work in modding them.  This mod is free, and originally posted on loverslab.com.  -amorrow28