Princess Fairytale Hall: Anna & Elsa

A young fan gets to meet Disney Frozen princesses Anna, left, and her sister Elsa, right, during a meet-and-greet event at Walt Disney World Resort. The National Retail Federation expects Frozen princesses to be among this year's most popular children's Halloween costumes.

(Matt Stroshane, Associated Press file)

CLEVELAND, Ohio -- If you haven't yet found a costume for your aspiring "Frozen" princess or Teenage Mutant Ninja Turtle, you'd better get cracking. They are among the top 10 hottest children's costumes this Halloween, says the National Retail Federation.

NRF's annual Top Costumes Survey reports that an estimated 2.6 million children plan to dress up as one of the characters from Disney's "Frozen," with another 1.8 million planning to morph into a Teenage Mutant Ninja Turtle.

Top children's costumes:

1. Princess

2. Animal

3. Spider Man

4. "Frozen" character

5. Action figure/Superhero

6. Batman chacter

7. Teenage Mutant Ninja Turtle

8. Witch

9. Pirate

10. Superman

Top adult costumes:

1. Witch

2. Animal

3. Batman chacacter

4. Pirate

5. Zombie

6. Vampire

7. Doctor/Nurse

8. Action figure/Superhero

9. Princess

10. Wench/Tart/Vixen

Top pet costumes:

1. Pumpkin

2. Hot dog

3. Devil

4. Bumble bee

5. Cat

6. Batman character

7. Superman

8. Witch

9. Ghost (tie)

9. Pirate (tie)

10. Star Wars character

Source: National Retail Federation's annual Top Costumes Survey.

They will join the 3.4 million princesses, 3 million animals and 2.6 million Spider Men expected to come calling for candy on Oct. 31.

But children aren't the only ones planning to dress up, eat candy and let loose this Halloween.

About 75 million Americans -- nearly a quarter of the country's population -- plan to wear costumes this Halloween.

Favorite adult costumes include: witches (4.8 million); animals (2.6 million), Batman characters (2 million), and pirates (1.8 million).

Among Halloween lovers, 14.3 percent plan to include their pets in the fun.

Of those, 10.8 percent will dress their pets as pumpkins, the favorite costume again this year. Other top choices: Hot dogs, devils, bumble bees, cats, and Star Wars characters.

The National Retail Federation expects consumers to spend $7.4 billion on Halloween this year, or an average of $77.52 on costumes, candy and decorations.

The $2.8 billion that will be spent on Halloween costumes includes $1.4 billion on adult costumes, $1 billion on children's costumes, and $350 million on pet costumes.

That's still less than predictions by the International Council of Shopping Centers, which expects consumers to spend an average of $125 on Halloween-related purchases, for a collective $11.3 billion nationwide this year.

"Children and adults love to celebrate this fall holiday in all sorts of ways, and it's clear dressing in costume will be a top priority for millions of people this year," NRF President and Chief Executive Matthew Shay said in a statement.

"Given the popular holiday falls on a Friday this year, retailers can expect increased web and in-store traffic in the weekdays leading up to the big night, meaning consumers will need to keep their eye on specific must-have items as they are likely to go fast."

NRF's 2014 spending surveys, conducted from Sept. 2 to 8 by Prosper Insights and Analytics, asked 6,332 consumers about their Halloween spending habits. The poll has a margin of error of plus or minus 1 percentage point.

Prosper Insights Principal Analyst Pam Goodfellow said in a written statement that "We're surprised each year with the range of different costumes, and I'm sure this Halloween will be no exception, especially given the historic number of people planning to buy costumes for themselves, their children and even their pets."