Why is Every Halloween Costume a Sexy Version of?

I have noticed a depressing trend in women's Halloween costumes lately. It seems the sluttier and more ridiculous the costume is, the more popular it is. I used to love going to the Halloween store every year to get some great gothic accessories or long gothic dresses. But within the last 5 years or so, all the long gothic dresses have been replaced with useless sexy versions of my favourite costumes. The brides have short skirts, the gothic dresses have tutus, and even the zombies are sexy now. And the quality has really gone down hill on the dresses. They look terrible. The worst part is the little girl's costumes are sexy versions too! I feel bad for parents with preteen girls. There is nothing that is appropriate for that age group. 

The costumes I bought 15 years ago still look great. I can still wear them. This year I looked for something new to wear for Halloween and left disappointed and empty handed. It's not like I don't have a million costumes to pull together out of my closet, but I still enjoy shopping for a new one every year. I think the last time I bought a costume from a store was about 5 years ago now. 

I wish now I had taken some pictures of the offending costumes at the store. But I didn't, so I have pulled a few pictures together from Pinterest for some examples of what I'm talking about...

The sexy Chucky doll?

The sexy Freddy Krueger:

The sexy Ghostbusters:

The sexy Lumberjack:

 The sexy Pirate:

The sexy Ghost:

The sexy Dorothy?

Even poor Glinda the Good Witch didn't escape her dress being shortened:

And my favourite- The sexy Wednesday Addams:

So when did Halloween turn slutty? And is anyone else annoyed at the terrible selection at the stores now? What do you think?