Sue,
You can try this tool to narrow down a few things.
http://roberttaft.com/no_filter.htm
Use the search terms you are targeting for your site and search "without filters". See how you rank then.
If you rank fairly high, you know you have to work on a few things. Usually the place to start is relevant ibl's (inbound links). There are tons of linking strategies and you have to choose the one you are most comfortable with but I personally have been avoiding one for one link trades. They can actually hurt more than help. Instead, You might consider trading links with someone using another site of yours. Meaning you give them a link to a site and they in turn give you a link to your panties site from a different site of theirs. There are a few other areas to look at but I would start there.
