White, long sleeves loose or fitted, modest neckline with no cleavage, at least mid calf but at least a few inches off ankle ankle length is preferred . Avoid anything sheer. Hope this helps! Congratulations!
For the Strength of Youth standards. Basically they should cover the garments without altering the garment in any way.
During the actual sealing you need to wear temple clothes - white, long sleeves, ankle length. For photos/reception afterward can wear short sleeves, shorter skirt, colors, etc. Some great examples of what to wear during the sealing are at modwhite.com or latterdaybride.com/collections/lds-temple-dresses the church also sells some options at store.lds.org
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