Clothing question???

Is this a bikini or underwear?



http://www.flickr.com/photos/51775641@N04/4815858982/in/photostream/



http://www.flickr.com/photos/51775641@N04/4815859040/in/photostream/



http://www.flickr.com/photos/51775641@N04/4815236279/in/photostream/



http://www.flickr.com/photos/51775641@N04/4815859134/in/photostream/
The picture quality isn