John Gill Commentary Luke 19:36

"And as he went, they spread their garments in the way." — Luke 19:36 (ASV)

And as he went
Riding on the colt towards Jerusalem:

they spread their clothes in the way ;
not the disciples, for they had put their garments upon the colt; but the multitude, which either came with him from Jericho, and other parts, or that met him from Jerusalem, or both; see (Matthew 21:8) (Mark 11:8) and so the Persic version here; "men put off their clothes and cast them in the way, that he might pass over then"; (See Gill on Matthew 21:8).