princess
clown
A Princess
Jest Originals - 2011 Obama Halloween Costume Advice 1-5 was released on: USA: 19 October 2011
PIX News at 10 - 2011 Halloween Psychology What Your Costume Says About You was released on: USA: 28 October 2013
A quick web search shows one existed in 2011. You'll have to check around closer to Halloween.
Here are some websites that have family costume ideas: http://www.halloweenexpress.com/family-costume-ideas.php; http://familycrafts.about.com/cs/halloween/l/blhalcgroups.htm; and http://randomosityblog.com/2011/08/sibling-couple-and-family-costume-ideas.html
vampire
Halloween in 2011 was Monday, October 31st. Halloween is always celebrated on October 31st.
for girls either nikki minaj, witch, angel, cheerleader or anything simple for boys either batman, michael jackson or sumthin simple
Halloween was on Monday, October 31st in the year 2011.
Walmart would almost certainly have one closer to Halloween, but if you want one right now you can get one at www.buycostumes.com or any other good online costume shop
Halloween Wars - 2011 was released on: USA: 2 October 2011