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Hey! I know this is a kind of late response but to give you some information for cosplaying:
Basic resources:
Tips and info:
IMPORTANT INFO
Do your research on wigs (and everything else) and especially contacts. There are so many resources out there, and all the information you need won't be on one site. Do your research and invest money in getting a good wig and contacts from trusted sources. Look for reviews on YouTube and other places, not just the store website. Don't settle for headaches and itchy eyes because it saved some money, please. It's worth it to save up.
My personal favorite shop for wigs and contacts is Uniqso. Another trusted and well-known source for contacts is Pinky Paradise, however I haven't used them myself. Amazon has wigs, too, and as Love Live is a popular franchise, finding reviews should be easy. Also, there's Arda Wigs, which arguably has the highest quality wigs for their average price range.
Make sure you take care of your stuff, too. Once again, especially contacts. Most circle lenses last 1 year if you take care of them properly (you can find that information on the bottles they come in and on the website you order them from).
BE CAREFUL, BE SAFE, AND HAVE FUN! Good luck!