Is it socially acceptable for individuals to wear clothing typically associated with the opposite gender? What are some reasons for or against this practice?

There are many reasons. This can be broken down into the eight broad categories below, though most people only think of no.6:

Reasons against it? Basically,

2) Fashion crossdressers - some metrosexuals and most women fall into this category. Women in trousers – seen as a sexual and social aberration in 1900 – had become the norm by 2000.

How do military families handle communication when a service member is injured overseas?

Socially acceptable? It depends on which bit of society you live in.

Ignore people who will quote their religion at you (unless it’s your religion too).

c) Drag queens and Drag kings – an exaggerated satirical sub-section of the light entertainment field.

I have received a fake legal notice, with unreachable phone number and unidentified address and fake lawyer enrollment number. The notice has caused my family severe stress. I know the person who might have done this illegal act. What should I do?

b) In light entertainment: female impersonators/comedians; pantomime dames in British theatre.

7) Transsexuals – for many of them the cross-dressing is merely an incidental stage in their transition of identity. Once achieved, the wearing of the clothes of the other sex becomes the norm, and can no longer be called crossdressing.

a) In serious entertainment, actors playing a role. From Mark Rylance as Cleopatra or Judi Dench as Olivia to Antony Perkins in Psycho. Japanese Kabuki and Nō players. Sopranos singing "breeches" roles in opera.

Music legend cancels concerts after coming out of retirement - Syracuse.com

4) Entertainers.

5) Other professionals: the occasional spy/undercover policeman/criminal in disguise. Gay prostitutes.

Don’t do it in places where it’s illegal, like Russia.

For the First Time Ever, the Colossal Squid Might Have Shown Its Secret Face - AOL.com

8) Those forced into crossdressing. This category is included for completeness but barely seems to exist in real life today. It was however observed in the period 1850-1950 when boys were occasionally forced into girls' clothes as a punishment at school or in the home. It is a staple of fiction – to escape from danger (Some Like It Hot), to obtain a job (Tootsie, Mrs Doubtfire), or forced by a sadistic female relative (much transvestite erotic fiction).

In Lancaster County, Pennsylvania or Salt Lake City it won’t be accepted. In Rio or Douarnenez at Mardi Gras it’s practically compulsory. (Seriously, I counted the men in skirts in a bar in Douarnenez: one in six.)

6) Transvestites – what most people first think of. For transvestites, crossdressing is an end in itself; motives many and various. For most, these go back to childhood or before birth and are obsessive.

'Worst I've ever seen': Pest control company seeing big increase in calls for rats - 13wham.com

d) Stunt doubles.

If you’re going to do it, do it 100% and do it well. You’ll enjoy it all the more and so will the people around you. It’s often good for a round of applause or a free drink.

If it’s merely your sexual fetish — see 3) above — don’t do it in public. You’ll look ridiculous and possible offend decency laws.

'Endling' is a shape-shifting debut that takes on heavy themes with humor - NPR

3) Fetish crossdressers - who use clothes as a substitute for, or an essential precursor to, sex. This is commonest among teenage boys, but usually disappears or develops into transvestism later. It is rarely seen in public, although the word "fetish" is often misapplied by those who should know better.

1) Occasional crossdressers - Hallowe'en, practical jokers, fancy dress parties, students' rags... etc.

Don’t do it unless you want to.

Never Too Late to Start Eating the MIND Diet That May Prevent Dementia: New Study of 90,000 Over Decades - Good News Network