For my tech position interview I wore nice slacks and a nice sweater. I didn't own any suits or blazers and I couldn't really afford to get one. While clothing is important, it is really important that you focus on your interview material. Know something about the place you are applying to - for example, know their mission and values and maybe something they are great at. Make sure you are prepared with at least one or two questions so that when they ask you about questions you are not feeling put on the spot. My questions usually include if I can do additional learning in the division of nursing I'm in. This might be inservices, getting certified as a tech in whatever type of nursing your floor is, etc. If you can show a lot of interest and really let them know what you will bring to the table for them it will make a good impression. Good luck, I hope you get the job!