They do make a difference. I had an FXRG Harley jacket for serious riding for several years and the 2 way Zip was really nice especially after stopping for a good lunch and getting back on the bike. Not so tight around the mid section... Now for more traditional jackets I wouldn't want it as it sort of takes away from the look in my opinion.
Sent my LW to great leather for one
John Lofgren Monkey Boots Shinki Horsebuttt - $1,136 The classic monkey boot silhouette in an incredibly rich Shinki russet horse leather. 
Grant Stone Diesel Boot Dark Olive Chromexcel - $395 Goodyear welted, Horween Chromexcel, classic good looks. 
Schott 568 Vandals Jacket - $1,250 The classic Perfecto motorcycle jacket, in a very special limited-edition Schott double rider style. 
it IS a thin jacket
Doing a bit of a Daniel Jackson today haha you sci-fi buffs will get that one
Will Clurman put one on if you request? I’ve never asked. I know his zipper replacement is first class.
No chance I could make a jacket but I am tired of paying the tailor for stuff I always think I could do myself!
I’ve never asked but my guess is no.
