I seem to be getting ENGINEERING skills while manufacturing clothes.
The ENGINEERING skill can be gained in all construction events, including the manufacturing of clothes.

What is the PROFESSIONAL STANDING?
The PROFESSIONAL STANDING is based on your skill level in different areas. The calculation of the PROFESSIONAL STANDING is very complex since it combines skills and attributes, which can be acquired by performing many different activities.

My disciple recently finished his training. Why did I not receive any mentor skills?
This is the way the system is designed. You will not receive mentor skills every time your disciple finishes his/her duty.