I used to safety pin my shirts closed but now I se fashion tape on my shirts. It hasn’t hurt any and I also wear silk (I’m female) they last 6-8 hours for me. Hollywood Fashion Secrets Fashion Tapes https://www.amazon.com/dp/B00AR4BLWA/ref=cm_sw_r_cp_api_glt_fabc_3S1ZC7A1F6H4HDBKS4R4?_encoding=UTF8&psc=1
Five hours with 40 people is a very significant exposure. I think you'd be fine with an N95. The N95 standard is all about consistency in the sense that no mask produced must dip under 95% filtration, but in practise most of them reach 98-99% filtration because manufacturers don't want to "fly close to the sun" so to speak; they're in trouble with CDC if they put out masks at 94.9%. I gotta say that even the most comfortable N95s are fairly uncomfortable, it wouldn't be pleasant wearing them for 4-5 hours. An alternative would be wearing a KF94 with fashion tape on the nose wire area, and possibly on the chin or sides to improve the seal even more. I did it for a hairdresser appointment and it works well. It sticks strongly to your face, but not so strongly that you can't remove the mask, it prevents fogging of your glasses and it stays sticky even after removing and putting it back on a few times. Don't forget to wear security glasses as well.
Fantastic job on the style! I bet it was fun to run around in.
I noticed there is a considerable gap between your brazier and the top of the corset/top/thing. Top keep it from slipping or shifting during the day, I suggest putting Fashion Tape between the two. The stuff I linked won't hurt the fabric of either material and will hold all day. This stuff is magical! Either way, keep doing your thing.
Glue. Yes, there is clothes glue. Well, tape actually: Hollywood Fashion Secrets Medical Quality Double-Stick Apparel Tape, 3 tins x 36 strips Value Pack https://www.amazon.com/dp/B00AR4BLWA/ref=cm_sw_r_cp_api_6DPCAbWDY3BHR
Double stick tape. I use the one linked below.
Hollywood Fashion Secrets Medical... https://www.amazon.com/dp/B00AR4BLWA?ref=ppx_pop_mob_ap_share
I wear my kippah every day and I am bald. I use double stick fashion tape. It works really well. Link below for the brand that I use.
Hollywood Fashion Secrets Medical... https://www.amazon.com/dp/B00AR4BLWA?ref=ppx_pop_mob_ap_share