On the Measurement Set tab of My Account, you'll see a box button called Measurement Set Library.
The Measurement Set Library contains measurement sets for common models. Some of these are virtual models and some are real and they are separated by type with a tab for each one.
The 3D Avatar tab includes measurement sets for all of the default avatars in Marvelous Designer software.
The other tabs includes measurements for real people. Each tab is specific to a body type. Read the description at the top to determine the best set for your use.
After you have chosen a set, select the copy button and it will be copied over to your account for you to use.
CAUTION - The sets don't always contain all measurements. You may need to fill in any that are missing, depending on what patterns you want to draft.