We're looking for either two directions: a design epitomized by the word "cool" or "classy", or a design epitomized by the word "fun". Maybe that's a bit too abstract so below are some sites that we like.
Website designs like bridge55.com, mexx.com, abercrombie.com and converse.com are unique, yet great to look at and stimulating in the sense they make you wanna click around. The eye candy makes you want to investigate further.
We would like something visually unique and untemplatey. Buttons that are tailor-made. Backgrounds that aren't uniform and have gradients or shades or changes in texture. A really strong look that looks and feels very different from what's out there.
That's abstract again, so maybe this might help: go for realistic and textures and fabrics, like hollister.com and the old fred perry site (see attached as fred-perry.jpg, it looks amazing) or go for fun and cute like the design features (fonts and buttons) for threadless.com.
I didn't want to go into specifics at first as I thought that might limit your vision, but I think in the interest of saving our time and economizing effort it would help if I put out some concrete pointers.
In general, white backgrounds for clothing websites work a bit better, as it allows the clothes to show themselves off. But other than that, the other elements are really up to you, and your imagination. We like the label logo from mexx.com, and the textures and backgrounds of the references, but we also want to "hear" from you and what you think would look nice.
I think the most solid advice we can give is to go with a white background without anything on it, either textures or patterns, but to embellish labels/buttons/toolbars, and the top and bottom of the site with your own visual flair in order to make the design beautiful. Also it might be better to keep it to earth tones, or turquoise/pastels as they best communicate the desired effect or a clothing workshop with a bit of refinement and prettiness, if that makes sense.
To sum up, the best tips we can think of is to combine a white background with pretty elements that you design, along with a strong visual theme that communicates a fun and refined fashion boutique slash workshop. But again, as we're not designers, we want you to express your vision, despite our design references. The only thing to keep in mind is the white background and the refinement, fun and prettiness/flair we're looking for. Everything else is up to you!