1. Give group costumes a try. This can take the stress off of everyone who doesn't have unique costume ideas and makes for great pictures!
2. Check the weather. Halloween temperatures vary (at least where I live they do) year to year. You don't want to be dressed for summer when the weather feels like winter.
3. If you can't walk in heels, now is probably not a good time to start unless you practice in the time leading up to Halloween
4. Try to be creative, your costume can be a great conversation starter!
