May I suggest if you are looking at belle but don't want to be stuck in her heavy ball gown you try her pink dress (there's something there- or at least I think that's what the song is called
) or her blue peasant dress they would be a lot less heavy. For cosplays you would want to check ebay and etsy you can also find good cosplays on sites such as hello cosplay or other sites of this nature. when it comes to conventions some choose to stay in cosplay the whole day and some don't if you are wearing heels for the whole day and you are not used to heels then flats would be advised and as to casual clothing it depends on who you are cosplaying for example if you are cosplaying as Spock you are less likely to want to change than a Cinderella cosplayer some cosplayers go as far as to make/bring a casual version of their cosplay. I can't give you any help with what there is to do at the con I'm UK based but you'll find lots to do I'm sure
For general tips you might want to check this thread http://www.cosplay.com/showthread.php?t=10988
its all about creating false parts (boobs) and curves also if you are looking for a good cosplay this one seems to check out well (sorry if it's not available in the US) https://www.etsy.com/uk/listing/2016...lay?ref=market
you'd need a hairbow but making fabric bows is easy there are many tutorials online for it. If you want to be convincing if you are showing your legs then shave or wax unsightly body hair isn't really common among female characters. Makeup is key (even if you are having a professional do it
) Eyebrows can change your face composition slightly a softer brow can mean softer eyes there are many tutorials on this contouring helps shape a face a more feminine look can be gained by contouring well there are lots of tutorials on this too youtube is a lifesaver for these sorts of things
Anyway I hope this post may have been of some if any help to you and that your project goes well. Good luck!