According to Hohenadel Modern Textile Dictionary

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Note added at 4 mins (2005-06-07 15:51:10 GMT)
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TROUSERS:

Trouser styles vary depending on the decade. In the 1840s they were narrow and tapered inward down to the instep with a strap going under the foot.

In the 1850s the strap disappeared and trousers became a little looser, though still snug to the leg. In the 1860s the \"peg-top\" trousers, wide at the top and tapering to the ankles, became fashionable. Formal evening trousers were always black, though for formal day wear they were usually a color that contrasted with the coat with white, fawn, and pale gray being the favored colors. For more casual wear (and for the more flamboyant), striped, check, and plaid fabrics were used.

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