Some costumes that adults like to wear on Halloween are: French Maid; Nurse; Witch; Dracula; Ghost; Devil; and Pirate.
http://www.costumecraze.com/ has the best costumes and sales. Just search "Sailor" and you have many kinds of costumes. They have costumes for kids, teens and adults
There are many adult Halloween costumes available for adults in 2011. Please see the following website: www.costumecauldron.com/Adult-Halloween-Costumes.html
You can purchase Mardi Gras costumes for adults at Target. If you want additional options, please see the following webiste for more information: www.purecostumes.com/
The Disney store (http://www.disneystore.com/clothes/costumes/adults/mn/1000395+1000777/) sells official Minnie Mouse costumes both for adults and children. Otherwise, ebay.com also has many costumes.
There are many different places where adults can rent costumes for a night. Local stores are good to check out. Costumer and Costumes Galore both will rent costumes online.
Yes there are Halloween treat costumes available. For your convenience I had provided a link to the website: www.squidoo.com �ۼ ... �ۼ Halloween �ۼ Halloween Costumes for Adults
Most major costume stores sell Disney Princess costumes for children and adults. You can also find costumes at the Disney Store or at Disney theme parks.
Halloween is most fun for coming up with unique costumes. Get ideas or shop at www.costumecraze.com which offers animal, historic, superhero and many more costumes for children and adults.
If you're all about selection it doesn't get any better than a site like frightcatalog.com for variety. They have thousands of costumes and about a hundred lion costumes for adults as it is. Give it a look and see what you think.
The store Party City supplies Grinch costumes for adults. Additionally you can try other similar party stores. Amazon might also offer a Grinch costume, or you could make your own.
Oyacostumes.ca has red Power Rangers costumes in stock for adults. Link is attached below.