Dynamic character system is under UMA\Extensions\DynamicCharacterSystem Scenes are under the Example/Scenes folder.
Wardrobe pieces are simply recipes that are set to Recipe Type "Wardrobe". Wardrobe Recipes can contain any number of slots and overlays, and are assigned to a specific "Wardrobe Slot" that is race specific - these are defined on the RaceData. Races are preconfigured with the most common wardrobe slots.
Adding a recipe to a slot removes whatever was previously at the slot. (So putting on a helmet, for example, removes the previous helmet.) Wardrobe Recipes can also be set to suppress another slot (for example, putting on the helmet can also suppress the Hair.)
Wardrobe recipes can also Hide parts of the base recipe. For example, putting gloves on the hands slot can hide the base models hands. This solves the "poke through" issues that can occur, and lowers resource usage.
The system manages this all by merging recipes when the avatar is built. A base slot can appear in any number of recipes. for example, you might have a "face" recipe that contains the head slot, and a "beard" recipe that also contains the head slot. The merging process will correctly apply the beard after the face during the build process.
"UMA DCS Demo - Simple Setup". This shows how to create a DynamicCharacterAvatar, and add wardrobe pieces, set colors, and adjust DNA. It's probably all you need for a single-player game.
"UMA DCS Demo - Using Asset Bundles". This is a more powerful demo that has the ability to download asset bundles, and add races and clothing on the fly.
"UMA DCS Tool - DNAConverterBehaviour Customizer". This demo allows you to edit the DNA Converter Behaviours.