Items To Have On-Hand All Day
These articles are things that you should have in your purse or have given to someone that will be easy to find all day long, like your Maid of Honor or your Mother. You will find that you'll be very thankful that you have all of them, even if it turns out that they weren't utilized.
-Hair Brush
-Nail File
-A Pair of Panty Hose
-Hair Spray (make sure that the cap is on tight and it has a lid)
-Mints or breath strips
-Small Mirror (nonbreakable)
-Bobby Pins
-Handkerchief
-Perfume (just a little on a cotton ball, stored in a tiny ziplock bag)
-Makeup

Items for General Maintainence
Have these items in a handy place for yourself and your bridesmaids. I think that you will find that most of the woman sharing in your big day could find use for a lot of these products.
-Straight Pins for Corsages
-Cotton Balls and Q-Tips
-Comfy and Pretty Slippers
-Makeup (Bronzers or multi colored beads that will add color to any complexion)
-Nail Polish (Excellent fix for runs in hosiery)
-Black marker for scuffs on rented shoes
-Spot Remover (test it on a swatch before using)
-Static Release Spray
-Extra Garter
-Chalk (Covers dress mishaps)
-Wrinkle Release Spray (test it on a swatch before using)
-Lint Roller
-Sewing Kit:
1. Buttons
2. Needle
3. Thread that matches the wedding dress, bridal party dresses, tuxes
4. Safety pins
5. Scissors

Toiletry Kits for Restrooms
Put these items in pretty baskets, decorated to match your color scheme. Place them in the Men's and Women's bathrooms. Your guests will thank you for being so thoughtful.
-Aspirin and Ibuprofen
-Band-Aids
-Saline Solution
-Deodorant (Spray, just in case you need to share)
-Eye Drops
-Unscented Lotion
-Moist Towelettes
-Smelling Salts
-Tampons and Pads
-Tissues
-Mouthwash
-A couple of diapers for small attendants or guests
-Tums or Rolaids
-Odorless Insect Repellant (For outdoor ceremonies)
-Suntan Lotion

You just never know
Hopefully you won't need any of these, but just in case, take them along and you can be sure that any oversights will not lead to a disaster.
-A small amount of cash
-Identification
-Umbrella
-Watch
-Dry Snacks (granola bars, raisins, M&M's, nuts)
-Duct Tape (For quick repairs to decorations, or to control unruley garments)
-Disposable Camera
-Bottled Water
-Maps or directions to the reception
-No-Slip pads for the soles of new shoes
-List of contacts and phone numbers including family, the wedding party, florist, DJ, Caterer, etc.

You can't go wrong! With this complete kit, everyone in your party and your guests will have all the OOPS covered. No Sweat! Have an incredible and worry-free wedding day.