As Ray says on my other question:
BOTH pictures present him with fake hair. Initially, the producers didn't want a bald captain, so they issued Patrick Stewart a toupee. I don't know when, why and how this idea changed.
But I can't find anything to substantiate it.
Gene was so right. Plus...I've seen or read (not sure which) an interview with Stewart in which he explains that wigs were tried on him, but he simply looked like a bald guy in a wig, so they let him be natural.
But no one has a reference.
Memory Alpha only says that he wore it for a flashback.
The only other reference I found about it is here but nothing conclusive.
Did he wear a toupee for his audition?