Who can advice on this?

Here's a friend who needs help so she is selling off her preloved clothes and she got a message today from a forum member.

The buyer with below message:

i mean the condition of the clothing..
if i send to my customer.. she will know is old?

For the first time in my life that someone is buying something used then sell it like a new item? I don't know what to say, best advice would be the buyer need to be honest?

What would you reply to the buyer?