Adding pockets to a jacket is possible when the fabric and construction can support the chosen design. A surface patch pocket is generally more accessible than cutting a new welt opening into a finished garment. First decide what the pocket will carry and how that weight will affect the jacket.
Test placement while wearing it
Make a paper pocket shape and check its position with the jacket on. Reach into the intended opening while standing and sitting. Avoid blocking existing pockets, closures or seams, and consider where the contents will sit against your body.
Inspect the inside of the panel. A lining must be kept separate from the attachment unless the design specifically incorporates it. Fine or worn fabric may need appropriate support rather than a heavy pocket sewn directly onto a weak area.
Prepare the pocket before attaching
Choose compatible pocket fabric and plan the opening finish. Test that your intended object fits without stretching the opening. Finish or fold the remaining edges as appropriate and baste the pocket in position.
Stitch using a suitable needle and thread, keeping the lining and pocket bags clear. Reinforce the opening ends with a construction suitable for the material. Heavy stitching alone does not compensate for inadequate fabric strength.
What if you want an inside pocket?
Check whether the lining can carry the load or whether support must connect to the outer construction. A phone can distort a lightweight lining. Ask a tailor about a supported design and an accessible lining seam. For a waterproof shell, additional needle holes can affect protection, so seek an approved method before adding sewn pockets.
Related reading
How to document jacket sample approval. For another useful reference, see Outdoor jacket fabric guide.
