These are for female characters only; I have not converted male versions of the Summer Shorts into flats.
Where To Find:
Craft it at the chem station under "Flats", or the armorsmith workbench under "Outfits - Dapper" if you downloaded the Armorsmith Extended version (requires Armorsmith Extended). Change colors at an armor workbench.
Installation:
Use NMM or drop archive files into your Fallout4/data folder.
Uninstallation:
Use NMM or manually remove the files that came with the archive.