Had a blast cosplaying at AX all four days this past weekend. Went as Raven on days 2 and 4. Had a ton of fun moments including one in which a fellow attendee and I joked around about the “Best Mom” pin I wore on day four. Looking forward to my next convention! More photos can be found on my personal IG ( rainistender ).
You should use a body painting product for this, as it will be skin-safe.
My top recommendation would be to get an alcohol-based paint, as this will last a long time, and as it is not dissolved by water, you don’t have to worry as much about sweating it off. A product that is already in liquid form is easy to brush or sponge on into the shape of the scales. Be sure to also get the special remover for the paint, and moisturize well after removing it.
You can also try a water-based paint, which is easier and cheaper to obtain than alcohol-based, and won’t have as high of a risk of smudging as a creme paint/grease paint would. This is usually in cake form and activated by water, and you can brush it onto your skin. Be sure to seal this well with a spray-on makeup sealer.
Creme paints/grease paints would be my last choice for this, as the paint tends to smear, even when fully saturated with powder, but it would create a more sweatproof alternative, so if you can’t do the others, this would still work as long as you are careful to set it with a large amount of translucent powder and spray it with sealant afterwards.
For any issues with sweat in the heat, I would recommend a setting powder that contains antiperspirants (many theatrical makeup powders have these) to help prevent sweating to begin with. You can also bring your makeup with you for touchups throughout the day.
What I would recommend for this is using a white interlining. Instead of using a single layer of your white fabric, you can use two layers so that it is more opaque when overlaid on the pink. This will make the jacket a bit thicker, but it will solve your opacity problem. You can also find a thinner fabric with enough stretch for your needs to use as an interlining, if you need.
If you don’t want an entire new layer, you can interface the outer layer with a stretch interfacing, though this will change the body of your fabric.
If you want to change your fabric entirely, this would work well out of a thicker ponte knit fabric. This is a firm doubleknit fabric that works well for structured but soft garments, and it has some stretch to it (usually up to 25%). You may have better luck with your lining not showing through if you use this.
Think of ways to merge the two outfits. Maybe you have the academy uniform’s structure but the colours that Weiss wears. Maybe the academy blazer is worn over Weiss’ normal outfit. Maybe there are patterns that can be added as small details to the uniform. Does Weiss have a prop? Can that be Boku-No-Heroified? What is the story behind this crossover, does she have a reason for being there? Can this reason be shown in the outfit or props? Could she simply be a person in the Boku universe who is also a RWBY fan with a RWBY plush or button?
Maybe the best solution is just Weiss’ wig and a school uniform. Then, is there anything you can add to really make her recognizable? Poses, makeup, contacts? What really makes it clear who you are supposed to be?
I don’t have any answers for you because this is your crossover costume. Try drawing or photoshopping the look to see if it works and brainstorm what could be added or taken away.
I use elastic (sewing elastic/elastic waistband/flat elastic) to make loops. Then I tack it in place with a couple hand stitches. Since it is a strong material it doesn’t usually break and since it stretches, it moves with your hand so it doesn’t cut off circulation. Sometimes, after a lot of wear, the tacking stitches will get loose. I keep a needle and thread in my cosplay-fix-kit in case this happens.
You can do it! If you are feeling unsure about making a sleeved shirt or shorts I suggest using a sewing pattern, that will guide you along the way. Look for easy-sew patterns that won’t make it overly complicated, simplicity and newlook are good for those. Because they are basic garments, you can find guides on how todraft shorts/pants and shirts with sleevespretty easily.
I wouldn’t suggest directly attaching the boots to the shorts by sewing them as one piece. Instead I would make the boots separate, with zippers so they can fit tightly along the leg – look at other thigh high boots for inspiration. If they’re tight enough they should stay up on their own, but if you need that extra support to keep them from sliding down then you could use garters or snaps.