What are some ways to hide that someone had a sex change?

Transgender Issues: It really depends on what you're concerned about and whether you are a male to female or vice verse. There will always be procedures to camouflage the original sex but some things cannot be changed such as the width of your shoulders or the functionality of a reconstructed penis. Otherwise there are many transgender sites you can find with suggestions on dealing with your concerns.

Are you asking : because you want to know how? or you suspect a loved one has had a sex change. In either case, people dress discreetly and behave privately or quietly so as to not bring attention to themselves until they are sure how to act in social situations. I have seen transgender/transexual people and have been respectful and kept my distance as i was unsure how they wanted to be addressed as man or woman