If the clothing is conforming, then you will need to conform the items to Dawn. Two ways to conform clothing to figure. If you own the most recent Poser versions, select the clothing in the Library and drag & drop onto the figure; this is one way to conform clothing automatically. The second way, select the clothing item in your preview tab, select figure from the taskbar menu and select conform to... from the pull down. A window will appear with figure options, select the figure you want the clothing to conform to and click ok. This should do it unless the clothing is dynamic, in which case, this is an entirely different process.

Always state which Poser version you are using to facilitate giving you the correct information. Different versions may lack some features outlined above. It will also help if you include which specific content you are attempting to incorporate into the scene. There are different approaches to working with specific content and getting the best results.