Official Disguise & Protocol Guide
Casual or dressy - wear whatever your members would ordinarily wear. Spies like to blend in and hide in plain sight!
Try adding one item to your otherwise casual attire that hints at either the Colonial period dress style. Carry a cane or a pocket watch, or maybe a bonnet made from a cloth napkin and string or an apron folded at the waist a la Colonial tavern wench style.
Try adding a single accessory that could be mistaken for hiding a spy gadget, like a pair of glasses, a big belt, or a chunky piece of jewelry.
If you will be meeting outside someone's home, keep refreshments simple for traveling, set-up, and clean-up. The location is the key mood-setter.
Dress the way you always do, but throw in some essential spy gear, like a small notebook, tiny camera, or even a fake "pen gun"! You can find these at costume shops.
Use real costume accessories that reflect Colonial apparel. Many costume accessories and staples can be found visiting online costume stores.
Try serving food or drinks on, or in, unusual containers!
Go for "vintage" spy - trenchcoats, hat, sunglasses
Dress in the style of your favorite character from the novel. Be sure to match the time-period!
If your guests are joining you online, instruct them in the invitation to join in disguise. Make generous use of filters!
If you are hosting a BYOB or an online book club, include instructions in the invitation that your guests conceal their drink and/or food by using unusual containers and give them creative cover names. This is a Bring Your Own Concealment and Cover event!