Bella Twilight Costumes Mostly Bella: Bella's Meet the Cullens, Tree top run, and Bella's Lullaby Outfit

http://www.cosplaysky.com/index.php/twilight-bella-swan-green-kangaroo-henley-shirt-costume.html

I had a really hard time find a shirt that was very close to this one.

http://www.angelasrunway.com/shopDetails.asp?CatId=12&ProductId=2958&SubCatId=78#

http://www.singer22.com/sp34slthhe2.html

An Aeropostale one is on ebay in size XS

Top:
Abercrombie & Finch has a somewhat similar shirt.

http://www.abercrombie.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&catalogId=10901&productId=429074&langId=-1&categoryId=12274&parentCategoryId=12203&colorSequence=16

http://www.bluefly.com/White--Warren-malachite-cashmere-hooded-tunic/SEARCH/302444601/detail.fly

http://www.zappos.com/product/7410693/color/92668

Old Navy has a hooded shirt with a kangaroo pocket.
http://oldnavy.gap.com/browse/product.do?cid=7526&pid=634286&scid=634286022

Organic Style has one that doesn't have the pocket
http://www.organicstyle.com/p_1161/boat-neck-henley-green-l.html?subCatId=513

Roxy made a sweater that has some likeness.
http://www.skateamerica.com/store/Roxy-Ladies-Sweatshirt-Clementine-Kelly-Green_P22977C1135.cfm

http://www.6pm.com/n/p/p/7463236/c/529.html

http://www.jcrew.com/AST/Browse/WomenBrowse/Women_Shop_By_Category/knitstees/perfectfittees/PRDOVR~97760/97760.jsp

http://www.overstock.com/Clothing-Shoes/Energie-Junior-Girls-3-4-sleeve-Button-Thermal-Top/3014004/product.html?cid=54553&fp=F&siteID=q5QZHUbCIj8-ggq2KJCQITayvI5Px2dZAw

http://www.6pm.com/n/p/p/7348800/c/275.html

http://www.shoplastyle.com/tier/SplendidClothing.asp?SKU=SPL958

http://www.chrisi.com/splendidhoodthermalb.html

Pants:
http://www.bluefly.com/AG-Jeans-brown-corduroy-Casablanca-slim-fit--pants/cat590054/301118101/detail.fly?referer=cjunction_1609763_10436858_tfc_-_1_217_090306_55c715712c57d5716e5bc38660e644d1

Headband:
This is the closest one I have found yet.
It is a Goody, Stay Tight Headband

I cannot find a store to purchase them in though.
Goodys website says you can purchase them at Kroger.
http://cgi.ebay.com/Set-Of-2-Goody-Stay-Put-Gripped-Headbands-Black-Blue_W0QQitemZ250387559064QQcmdZViewItemQQptZLH_DefaultDomain_0

http://www.tillys.com/tillys/variants.aspx?cid=1097&prod=146814145&ctlg=020_Girls&source=1&size=

http://www.franceluxe.com/pc/LI2165/lerickson_headbands/index.html

Jewelery:
Bella's Ring is $34.95 and it is made from moonstone.
http://www.banglesofhope.com/Bellas-Twilight-Moonstone-Ring-40Sterling-Silver-and-Moonstone41-_p_80.html

Bella's Bracelet is silver and turquoise and it costs $54.95
http://www.banglesofhope.com/Bellas-Turquoise-Twilight-Bracelet-40Sterling-Silver-and-Turquoise41_p_77.html

Bella also wears a wooden St. Jude bracelet.
http://www.giftscatholic.com/item/St-Jude-Cherry-Wood-Bracelet-1775.html

http://www.intermixonline.com/product/accessories/bracelets/bead+bracelet-+turquoise.do?keyword=mummy+pencil+skirt&page=1&search=basic

Sterling Silver & Sleeping Beauty Turquoise Bracelet.
Handmade by Rhett Lewis.

http://www.etsy.com/view_listing.php?ref=sr_gallery_13&listing_id=23010635&ga_search_query=twilight+bracelet&ga_search_type=tag_title&ga_page=4&min=&max=&order=

http://cgi.ebay.com/-Handmade-Turquoise-&-Silver--Bracelet-by-Rhett-Lewis-_W0QQitemZ330318188747QQcmdZViewItemQQimsxZ20090330?IMSfp=TL090330152001r19989

http://www.etsy.com/view_listing.php?ref=sr_gallery_2&listing_id=21802978&ga_search_query=twilight+bella+bracelet&ga_search_type=tag_title

http://www.etsy.com/view_listing.php?ref=sr_gallery_15&listing_id=21820489&ga_search_query=twilight+bella+bracelet&ga_search_type=tag_title

http://www.etsy.com/view_listing.php?ref=sr_gallery_11&listing_id=22780182&ga_search_query=twilight+bracelet&ga_search_type=tag_title&ga_page=13&min=&max=&order=

http://www.etsy.com/view_listing.php?ref=sr_gallery_15&listing_id=23015913&ga_search_query=twilight+bracelet+bella&ga_search_type=tag_title&ga_page=&min=&max=&order=

http://www.etsy.com/view_listing.php?ref=sr_gallery_13&listing_id=21814107&ga_search_query=twilight+bracelet+bella&ga_search_type=tag_title&ga_page=21&min=&max=&order=