Now just their jeans will be tight!

Hipsters are finally getting some breathing room on the constantly packed L train, following an MTA study that calls for added service to accommodate the fastest-growing line in the subway system.

The MTA is adding one more train to the morning rush hour in December and gearing up to add several more during peak hours by as early as mid-2012, according to an MTA report.

Weekend L service will increase by next summer, said state Sen. Daniel Squadron.