Advice wanted on what I should do?

I have a product which I'm currently marketing towards women in the UK, but I have a dilemma on what to do next.

I can see other segments of that same market that I'd also like to start targeting, but I'm a little worried that some confusion may arise for my customers. i.e. I'd like to offer the same product with different custom sizing, postage, packaging options.

So how can target these people without confusing or damaging my current website customers?

- use a subdomain off my main site (worried the traffic my get mixed up and that I'd end up having to explain price differences).
- set up a new website - long time to get established problems with having to buy another software licence for essentially the same product, explaining why a different website appears on customer credit card - duplicate content leading to google banning me etc.

Sorry for the long post, just looking for a point in the right direction, before making a stupid mistake.

The thread was moved from General chat, although I wouldn't have thought to put it here.