Sources for modern clothing patterns/fabrics?

I'm currently working my way through the collection by http://www.sewaholicpatterns.com/. The designer's blog has tons of tips, tutorials and sew-alongs, which are super helpful. I've also emailed her on a couple of occasions with silly newbie sewing questions and she's given me a lot of great advice. The patterns are on the pricey side, but aside from that I can't recommend them enough.

I'll add http://sewingcake.com/, http://www.deer-and-doe.fr/ and http://byhandlondon.com/ to the list of indie pattern companies. Finding soft cottons, especially online, can be tricky. But I have had consistent good luck with designer voiles, for example these from http://www.fabric.com/SearchResults2.aspx?Source=Header&SearchText=voile&CategoryID=1d5f47dc-9991-4088-93f3-26a376046a5e&rfc=1&rfn1=Designer&rfon1=Valori%2bWells&rfov1=Valori%2bWells, http://www.fabric.com/SearchResults2.aspx?Source=Header&SearchText=voile&CategoryID=1d5f47dc-9991-4088-93f3-26a376046a5e&rfc=1&rfn1=Designer&rfon1=Joel%2bDewberry&rfov1=Joel%2bDewberry and http://www.fabric.com/SearchResults2.aspx?Source=Header&SearchText=voile&CategoryID=1d5f47dc-9991-4088-93f3-26a376046a5e&rfc=1&rfn1=Designer&rfon1=Amy%2bButler&rfov1=Amy%2bButler.

Look at http://www.hotpatterns.com/. http://sewliberated.com/products has some really nice stuff. (I keep meaning to get a couple of patterns, but keep getting distracted.) http://www.sewserendipity.com/index.php?cPath=22 has some nice things too -- disregard the piecing/multiple fabrics, and look at the lines. For something in a more classic line, look at http://www.casualelegancefabric.com/ or (link is to their patterns at Vogue Fabrics, as the Textile Studio website is awful, at least on Firefox). For fabrics, http://www.voguefabricsstore.com/, http://www.fabricmartfabrics.com/home.php, http://www.gorgeousfabrics.com/shop/index.php, and are among my favorites. There's always , too.

I just found http://www.victorypatterns.com/, she has some really cute patterns either print yourself or traditional paper patterns. And I feel like all the modern sewists are making the http://www.shopwiksten.com/category/shop-patterns tank or tova shirt. You might also take a look at http://www.craftsy.com/ -- it costs more since you're paying for the full tutorial as well as the pattern, but I've found a couple things there.

I wish your profile said where you live. A lot of cities have at least one fabric store that caters to a more fashiony, rather than crafty, clientele, but it's impossible to point you there without knowing where you live. If you aren't willing to say where you live, perhaps there's a local college that has a textile or apparel design program near you? Call and find out who they'd recommend for high quality apparel fabrics. I like to sew from vintage fabrics (re-makes from vintage clothing or using vintage linens/deadstock fabric) so I can appreciate not wanting to work from the lower-quality fabric that your average Joann or Hancock stocks. But sometimes a straight quilting store will have access to better fabrics than just cheap quilting cotton and can point you in the right direction if they don't actually stock what you are looking for.

BurdaStyle! Their magazine and website are great.

In cotton fabric selections, seconding voile and suggesting cotton lawn and cotton lane as search terms for your internet hunt.

In addition to the pattern companies mentioned above, I highly recommend StyleArc. Yes they're in AU, yes shipping adds to the cost, but for fully clean, modern styles with a terrific fit, they are hands down my favorite and well worth the cost. They are single-size patterns, but the designer is wonderfully responsive and will answer any questions you might have about which size to order. For fabrics, I second Fabric Mart, and I also like the selections that http://www.marcytilton.com/index.php?cid=17 offers.

In addition to some of the patterns listed above, I really like http://shop.grainlinestudio.com/ patterns. There are also https://www.etsy.com/shop/PatternRunway, https://www.etsy.com/shop/Salmepatterns, and http://www.namedclothing.com/ — though I don't have as much/any experience with these. For fabric I usually look at the places jlkr mentioned. I'd add http://www.moodfabrics.com/, http://www.britexfabrics.com/, and http://organiccottonplus.com/. http://www.girlcharlee.com/ has some fun knit fabrics. https://www.superbuzzy.com/shop/ has a nice selection of Japanese fabric.