If you haven't already downloaded these items of "plain clothing" I made for Farmington, you may want to grab them here, for your Tranquility Ridge residents.
All of the clothing items inside the .zip files are in .package form. You will need to put them in your Mods folder inside your game files. If you don't know how to do that, you can find out how to do it HERE. There are more than one .package file in most of the .zips.
Coats for Women...
Men's and Boys' Clothing...
Women's and Girls' Clothing...
Old Time Swimsuits for Women...