Arguably, the most important change that happened for menswear after the French Revolution of the last of the 18th century, was the virtual erasure of surface detail as an important player in men's apparel. By that I mean, the focus shifted profoundly, from layered pattern, complex textiles, and multiple embellishments, to a focus on structure itself. It became all about the perfection of the cutting and finishing of a suit of clothing; not about texture, color, or fineness of decoration.
But lets take a look back at the prior century for a bit, here. Focusing on one particular suit, currently part of the vast collection of the Metropolitan Museum of New York.
The images here are of a French made suit from between 1775-and 1785. Its entirely of silk, and would have been an appropriate garment for an upper class gentleman, or a lesser noble. Its level of decoration marks it as not fully formal court wear, but it would have been acceptable as daytime wear for someone at court.
To begin with, the textiles commonplace to such clothing were densely textural, multicolored, and finely woven. For men, these were more often than not variations of stripes, dots, or diamond patterns. This one is a deep chocolate brown, camel, and cream.
In addition to the suit body, very often the buttons to be used for the suit would be covered to match, and each one embroidered with a miniature version of the motif of the decoration.
And here, more than 200 years later, we still feel the effects of that change.