Sometimes the very best Halloween costumes are the silliest, wackiest ones (or should I say quackiest ones). A duck costume, for example, although super cute when worn by a child, is just plain goofy looking when worn by an adult. You may want to look for a costume that has some kind of covering for the feet, since some costumes do not include footwear.
Duck costumes for adults:

Duck costumes for adults pictured:
Left: Big Duck Costume
Right: Rasta Imposta Ducky Adult, Yellow, One Size
Boxing costumes for women
When picking out a boxing costume for women, you may want to make sure first of all that the gloves are included, since this is not always the case. Shiny boxing shorts and a top that resembles a sports bra are a must, and a shiny satin or silk-like robe is a great addition. Shoes and boots are rarely included in costume kits, so you could use the boxing-style womens shoes that have become popular in recent years. Failing that you could use any lace-up boots or high-top sneakers.
Boxing costumes for women:

Boxing costumes for women pictured:
Left: 5 Piece Set Worlds Greatest Boxer Costume
Middle: Knock Out Female Boxer Adult Costume Size 6-8 Small
Right: Dreamgirl Women’s Down And Dirty Boxing Costume The costume lights up.
Greece costumes
There are various kinds of Greece costumes to choose from when buying on-line, but making a Greek costume is funner to do. If you want real simple, simply drape a white bed sheet over your body and adjust it to your liking. Wrap a colored scarf around the waist, or better yet, use a golden ribbon to make the costume more authentic looking. Footwear is a bit more complicated. You could go for a plain pair of sandals, but in order to be more accurate, they should have long gold laces that are wrapped around the legs, almost up to the knee. Accessorizing is so easy with bangles from the dollar store. Look for wide golden bracelets that you can wear high up on the arms. And women, you can have fun piling your hair up high and letting curly strands fall down to your shoulders. Or you could simply get a Greek goddess style wig.
Greece costumes:

Greece costumes pictured:
Left: Fun World Costumes Greek Goddess, Crème/Light Blue, Medium/Large 10-14
Middle: Greek Goddess Child Costume Size Medium (8-10)other sizes available.
Right: Greek Emperor Adult Costume