When the module 'Collaborators' profiles' is activated, you will be able to select 'Profile properties' underneath the gearwheel. This module enables you to request specific data from your collaborators, like their clothing sizes, their previous work experience, their CV and so on. 

The questions the collaborators need to fill in are fully customizable. There are 10 types of mandatory or optional custom profile data fields to choose from. The profile properties can all be used as filter when looking for a specific collaborator in your database or when looking for a particular profile for a job.