Without going full compression for Halloween, just do it with this simple black Nike tee with the logo in the right place.

These long black tights from Nike look a lot like the black compression pair that Serena wore in the notorious match.

Red Belt [Running Belt with Pouches] Serena's outfit had a simple red belt across her waist. A sports belt like this red one from Nathan does the trick.

This is a funny green mask of a Praying Mantis. There are over 2000 species in the mantis family, with a lot of similar-looking types, so this is hard to pin down to species. Match this with a lime-green outfit and hold your hands in a prayer position -- you can't go wrong. You could also go for the full costume with this choice.

You'll create a buzz when you wear this funny full bee costume complete with inflatable striped black and white rear. The mechanism stays inflated with a set of 4 AA batteries (not included).

Ick. This full cockroach costume hs fuzzy legs and long antennae. Ick. It's a hooded foam tunic costume with an authentic look. Ick. Wear this with brown tights or brown pants to complete the look. Ick.

Here's another costume that comes complete with extra legs. This outfit comes with the top that has a hood and extra spider legs. You'll also get an abdomen piece and knee and ankle accessories to pair with your own black pants, tights, or leggings for the seventh and eighth spider legs. Spiders aren't technically insects but they go well with this themed group costume.

Speaking of creatures that aren't insects, this mask of a banana slug goes well with an insect group costume even if it isn't technically correct. Pair this realistic mask with a banana-colored outfit to complete the slimy look. Leave a trail of moisture behind you for added authenticity.

Go as the beautiful monarch butterfly with this awesome and easy costume cape. Wear this with an all-black outfit and you'll be ready for Halloween. You can add an antenna headband and bug eyes glasses to complete the look.

Darth Vader probably has the most famous and most recognizable lightsaber out there, a simple single-light red number with lights, sounds, and voice.

Before he was Darth Vader, he was Obi-Wan's padawan, Anakin Skywalker. The eventual Dark Lord served under Obi-Wan and his blue lightsaber.

Do you know why Mace Windu has a purple blade on his lightsaber? Because that's the color actor Samuel L. Jackson requested!

This green bladed lightsaber is inspired by the one used by Anakin Skywalker's padawan, Ahshoka Tano.

This costume lightsaber is inspired by the blade wielded by Anakin Skywalker before he turned to the Dark Side. Fighting alongside clones, Master Skywalker used a blue lightsaber like this one.

This is another iconic costume lightsaber, complete with double blades. The two-sided red saber used by Darth Maul is very recognizable and a must-have for anyone dressing up as Darth Maul. This one includes LED lights and sounds.

This fun costume lightsaber is inspired by a new character to the space saga. This lightsaber has one long red blade and two smaller blades coming out of the handle, just like the one used by Kylo Ren.

This deluxe costume for kids comes with a muscle-chest printed jumpsuit with attached wrist gauntlets and boot tops. The outfit also comes with a mask.

This awesome kid-sized accessory has claws that extend and retract!

This awesome Black Panther costume actually lights up! The jumpsuit has light trim at the chest. The jumpsuit comes with a matching mask.

A set like this affordable and easy costume was our best seller last year. The kit comes with a Batman mask and cape. Add your own black outfit and you've got one easy kid-sized Halloween costume! This is a fun staple for any dress-up closet as well!

This fun felt pirate hat is ready for embellishments to make your costume complete. It's great for pirate costumes or Revolutionary War era outfits and school projects. Add pirate sparkle or patriotic colors to complete this hat!

Guardians of the Galaxy costumes were hot last year, including this best-selling Gamora adult costume. This outfit comes with shirt with mesh sleeves and all-over print pants.

This long wavy hair wig was popular last year! The wig has an ombre color scheme, ranging from red at the tip to deep dark red close to the scalp.

Descendants costumes were very popular in 2017, including this awesome Mal child-sized wig from Descendants 2.

Pet costumes are always popular. This Top-selling dog costume from 2017 was for Christmas, not Halloween! It's a Santa Claus costume for your four-legged friend.

This awesome bushy fake mustache was the top selling costume mustache on this site last year. Brown was the most popular, but this mustache comes in five colors.

A butterfly LED magic wand like this one was a big seller last year. This model has blinking lights, moving wings, and on board music.

Another Descendants best-seller for our list! This Evie costume includes a tunic with attached vest and leggings.

Possibly the most important piece of any Harry Potter costume is the Hogwarts-issued Gryffindor House school robe. This officially licensed robe is child-sized to reach ankle length.

If you're going to be Harry Potter, you'll need his round rimmed glasses. This officially licensed costume pair should do the trick!

This easy child-size neck tie is in the same pattern as Harry Potter's Gryffindor house. The maroon tie has golden yellow stripes.

This magic wand costume accessory isn't just for looks! This wand has light effects and three different movie magic sounds.

Play lazy Deadpool with this fun one-piece pajama set for adults. The red, black, and grey PJs include a hood for maxium comfort.

This adult-sized pajama one-piece comes complete with a masked hood and attached cape.

You don't have to wear skin-tight leggings and a bustier to go all Wonder Woman -- just pick up this awesome and comfortable superhero onesie!

Dress up as the hero Superman with this comfy one-piece costume pajamas. This one comes with a cape attached with velcro.

Dress up as the DC Comics character Harley Quinn with this fun adult-sized romper. The red and black one-piece includes a hood with attached mask.

This fun red romper is an adult-sized pajama set in the style of superhero The Flash. Get this and you can zoom off to sleep in a "flash"!