The night before your wedding should be all about relaxing, which I realize is almost totally impossible.  I have included some items below that can hopefully help you get the beauty rest you need before your big day.

First and foremost, make sure you wear a button down shirt so that you don't ruin your hair and makeup.  The pajamas and robe below are casual and modest enough to be worn during the preparation process if you get ready at home or in your hotel room. 
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Giverny Lawn Dori - Lauren by Ralph Lauren Pajamas $43.50
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Sirocco Bathrobe - Lacoste $49.99
If you are going to be wearing a strapless or off-the-shoulder gown, do NOT wear a bra as it can leave red marks on your skin.  Choose comfy underwear such as those featured below.
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Lowrider Hotpants - Cosabella $30
The smell of lavender is so soothing and will lull you into a deep sleep.  How cute is this candle?  Of course you can always pick up a Yankee version for a fraction of this price, but I just loved the label on this one.
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Lavender Leave Candle - Diptyque $60
You want your skin to look flawless and healthy on your wedding day, so moisturize the night before and the morning of with a non-sticky, lightly-scented lotion.  I recommend this one from Avon.  Skin So Soft makes my skin look radiant without leaving behind icky residue.
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Sot & Sensual Replenishing Body Lotion - Skin So Soft $5.99
Take your mind off of issues that may arise the next day and indulge your girly side with an old-fashion rom-com like Gentlemen Prefer Blondes featuring the ever fabulous Marilyn Monroe.  It will most definitely put you in a glamorous state of mind.
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Gentlemen Prefer Blondes $9.27
If you are going to a salon for your hair and makeup, slip on a simple button-down and linen pants.  Since you will be wearing heels the entire day, throw on a pair of flats.  And since you should always be glamorous, even at the hair salon, add a touch of gold with the casual feather necklace.
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THE SHIRT - Joe's Jeans $98
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Linen Boardwalk Pant - Banana Republic $69.50
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Vinaa - Steve Madden $59.95
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Feather Necklace - CC Skye $150
To all you brides out there - please try to relax and not worry on your wedding day.  You only get married once (hopefully) and you want to remember it as an exciting and happy time, not one wrought with worry and nerves.  I know its easier said than done, but everything turns out well in the end, so remember - imperfections are what make life interesting!