Freedomware -
 Swimwear for skinny dipping.
http://www.nudi.com

Hupyee Swimwear -
Reversible string bikinis, beachwear and body shapers by Hupyee.
http://hupyee.com

Island Girl -
 Women's, girls and juniors separates and custom designs.
http://www.islandgirlswimwear.com

Kiwi -
Provides a variety of bikinis, including thong, rio back and full cover.
http://www.kiwibikinis.com

Lili Bikini -
 Offers a range of bikinis for babies to young ladies.
http://www.lilibikini.com

Lusty Threads -
 Features a wide selection of Australian string or thong back bikinis.
http://www.lustythreads.com

Malia Mills -
Sells bottoms and tops separately based on size.
http://www.maliamills.com/

microkitten, llc -
Brazilian made designs including micro and string in a variety of fabrics and colors. Includes an online gallery.
http://www.microkitten.com