Nagala (MEIKO姉さん) is available to download via Index page and direct DL provided by the creator. This model can be edited for improvements, but it appears contact with the creator for this activity as well as redistributable edits is required.
Ver.1.04 ~ (2011/Feb/08)
The dress is similar in design to what was worn by a popular NND dancer named Yumiko. See YT upload Nostalogic - Yumikoさん