If you have a new range of clothing, then I think it is okay to post again. However if you need to add something in the same day, then generally it is better to just edit the first post. It helps keep the forums nice and organised, instead of someone having:

"Hllo, here is me."

And then making another post a minute later saying:
"Oops, I meant to say hello"

So if no-one has replied to your posts in a week or so, and you have a new range, then feel free to post again with the new clothes.

(Correct me if I'm wrong, Webbie)