Fashionary has been on my radar for quite some time. I remember purchasing one from their founder, Penter Yip back in 2009/2010. They have since grown in an amazing way offering an assortment of different products. They made a smaller version of the original sketchbook (which has somewhat of a resemblance to Moleskine Journals). They also offer up memo sets and the current collaboration, Fashionary x Sibling boxset. This notebook doesn't just offer light templates to design your fashion ideas, it offers a large database of patterns, types of clothing / pieces, a list of bookmarks via internet sites, layout ideas for presentations and also, font type ideas for your fashion company. I've included a photo to give you an idea of the useful information offered in this notebook.
Fashion Designers, this is the perfect tool to keep your ideas all in one place. Check it out here