Hello Halloween fellows, yes, I'm new and yes this is my first post so I can rant a little and share my thoughts on costumes.
My issue with the all-sexy-all-the-time costume trend follows along with my issues with store-bought costumes in general. For me, and I realize this is not true of everyone but I believe I'm hardly alone here, is that Halloween is not about cute. It is not about friendly. It is not sexy. Halloween is supposed to be SCARY. There are never any women's costumes that are really scary. Maybe a few accessories that are unisex, maybe there's a few men's costumes that might do, maybe you can do wonders with makeup or a mask or prosthetics. I still want more. And I feel like men's costumes are easier in this regard, because it might not be so unusual for a guy to want to be strong, powerful, frightening types of characters. I couldn't care less if a woman wants to do the sexy costume thing, because there are definitely times and places that's appropriate, but that should not be the only option. /feminist ranting ends here for brevity's sake.
I've been all varieties of horror monster/warrior/evil priest/creature. I was Pinhead one year, but while that costume is amazing that's a little too much pop culture recognition for our yard haunt. The last couple of years, I've wanted to maybe look a little bit like there's a woman under that costume (no, really, I've had it up to ^here^ with being mistaken for a guy b/c of my horror type costumes).
So, I'm DIY or die. Also, plus size costumes suck so there's that. The last few years, I've been a necromancer. A la Garth Nix's Abhorsen series, but think Chlorr of the mask rather than Sabriel herself. I've made all sorts of stuff - fake scale armor (ask me about how fun it isn't to apply billions of sequins by hand), dagger frog, Medieval inspired executioner type hood/capelet. Last year I made an awesome corset and skirt combination piece, because if a steel boned corset doesn't feel like armor and send you on a little evil cackling power trip I don't know what will. I've even got a big 4.5" diameter hand bell from Etsy - that sucker will wake the dead (or just the neighbors).
My advice is to find a character first, then find pieces that work with that. The Halloween stores are ok for props and masks and such (if you don't want to DIY) but I think it's easier to look for real clothes for the costume itself. Never underestimate the usefulness of leggings, tights, and the basic t-shirt. Also, having a weirdo, semi-goth wardrobe stash doesn't hurt. Also, big stompy boots and texture, texture, texture.