The tips that Angela and Ema have provided you are true... and reaching out to writers - particularly freelance writers who are not tied to one publication- is the way to go. If you have PR you need to find out what can be done to switch out to pitches.
I would suggest requesting or seeking out the editorial calendars for national and regional magazines you would like to be in. Editorial calendars are often online but may not be found easily at every magazine.
That way you will note when pitches should go in (which is often 3-4 months ahead of time). See if the editorial calendars are different for online writers/editors.
You should also reach out to specific larger websites to pitch writers there as well.
Online media can require shorter lead times and also require some last minute content so be flexible.
The pitches with specific ideas on what content you are pitching to them shoud be short and sweet, with a few photos but include short bits about the products being featured including various designers you are suggesting for features.
Novelty and unique ways to wear - -or styling-- is often a great way to get someone attention.