Sometimes customers that are losing their hair take an 'interim' step before taking the actual plunge to wearing hair. They use concealors. Toppik is a poplular one. There's also NexGen and ProThik plus others. A concealor is a tiny microfiber that adheres itself to thin hair and gives it the appearance of the hair looking thicker. Here's a before shot....I'm digging up the after shot and will post it.
Regards,
John