Ah, the elusive white wedding leather! If you think "biker leather", yes it is a bit harder to find. If you are considering wearing white leather be prepared to spend some time searching for it. It's just not that common and when you do find it, it's much more expensive than black.
If you find a style in black that you love, ask if the retailer can get it in white. Sometimes they just don't carry it and might be able to order it for you.
Here's a few online retailers that carry white leather halters, shorts and skirts:
Don't forget to check
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You can find items new with tags (nwt) and even lightly worn outfits can still look brand new. Just make sure that the listing states any and all flaws or send an email and ask. Be specific when you ask. The sellers idea of excellent condition doesn't necessarily mean the same as it would to you.
Look for vintage Michael Hoban designs from North Beach White Leather. These are usually short, sleeveless dresses paired with a jacket. Hoban's designs are highly collectible and will hold their value well.