Up to 1,000 people dressed in Harris Tweed jackets set off from Clerkenwell to take part in the annual London Tweed Run.
The event, which took in the major landmarks, is described as a "bicycle ride with a bit of style".
Cyclists stopped for tea in Tavistock Square and lunch in Kensington Gardens.
Crowds took photos as the well-dressed riders, some on vintage bikes including penny-farthings, toured the capital's streets at a fairly leisurely pace.
The riders, who also finished in Clerkenwell, were warned that "proper attire" was expected but bowler hats were a "spot more aerodynamic than top hats".
"We take to the streets in our well-pressed best, and cycle through the city's iconic landmarks," a spokeswoman said.
"Along the way, we stop for a tea break and a picnic stop, and we usually end with a bit of a jolly knees-up."

The ringed bird, known as KL, produced three chicks in the nest at Bassenthwaite near Keswick last year. Two were killed by magpies.
She has been joined this year by an unringed male.
The Lake District Osprey Project team said they were "delighted", as the birds do not always return to the same nest sites.
Project manager Nathan Fox said they were "hopeful for another successful nesting season".
The birds have been seen mating since they arrived, having spent the winter in west Africa.
Ospreys returned to the Lake District in 2001, after an absence of more than 150 years.
They have nested successfully every year, raising nearly 30 chicks.
The birds can been seen from specially-created viewpoints and visitors can watch live nest-cam images on screens at Whinlatter visitor centre.
Hundreds of cyclists swapped lycra for flat caps, trilbies, berets and their sartorial best during a 12-mile ride.
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A female osprey has returned to a Lake District nest for the fifth year running.