A good wool frock coat should last three decades of regular wear if treated right. Treat it wrong and three years is optimistic.
Quick answer. Care for a frock coat with five simple rules. Brush it with a horsehair brush after every wear. Air it on a wooden hanger between wearings. Store it hung in a breathable cotton bag, not in plastic. Treat stains locally with a damp cloth and specialist product. Dry clean only when necessary, perhaps once or twice a year at most. Follow these and the coat will outlast its owner.
The horsehair brush
The single most important tool for wool coat care is a horsehair brush. Soft bristles, firm handle. Brush the coat gently with the nap, from shoulder to hem, after every wear. The brush lifts surface dust, pollen and skin cells before they can work into the fibres. Thirty seconds a day prevents months of ingrained dirt. A horsehair brush costs 20 to 50 pounds and lasts a decade. The investment is worth more than any professional cleaning.
Airing between wearings
Never put a worn coat straight back into the wardrobe. Hang it on a wooden hanger (shaped to the shoulders) somewhere cool, dark and well ventilated for at least 24 hours. The wool fibres need time to relax and release moisture from body heat and ambient humidity. A coat put straight into a dense wardrobe develops creases, odours and loses its shape faster. For a well worn frock coat, 48 hours of airing is better than 24.
Storage
Store a frock coat in a cotton garment bag (breathable, lets moisture out) hung on a shaped wooden hanger. Plastic bags trap moisture and encourage mould. The storage area should be cool, dry and dark. Avoid storing near radiators, in attics or in basements. The ideal temperature is 15 to 20 degrees Celsius with less than 60 percent humidity. Cedar wood blocks or lavender sachets in the storage area deter moths without the harsh smell of mothballs. Avoid naphthalene and paradichlorobenzene mothballs: they leave a chemical residue that damages wool over time.
Dealing with stains
Treat stains immediately but gently. Blot (do not rub) with a clean white cloth. For water based stains (wine, coffee, tea), work from the outside in with cold water on a cotton cloth. For oil based stains (grease, salad dressing), apply a small amount of talcum powder, let it absorb overnight, and brush off. Never apply hot water or detergent directly: both set the stain. For serious stains, consult a specialist cleaner who handles period or theatrical costume. Most high street dry cleaners will damage a wool frock coat if asked to tackle a difficult stain.
Dry cleaning sparingly
Dry cleaning is harsh on wool. The solvents strip natural oils from the fibres, which over time leaves the coat brittle and dull. Clean a frock coat professionally only when it is visibly dirty, perhaps once or twice a year at most. Choose a specialist cleaner experienced with wool suits, bespoke tailoring or period costume. Mention the horsehair brush routine and ask them not to press the coat with high heat, which flattens the texture of the wool. The best cleaners understand that cleaning a bespoke frock coat is a conservation task.
Pressing and ironing
If the coat needs pressing, use a cool iron through a damp cloth. Never apply an iron directly to the wool. A steamer is better than an iron for most purposes, as the steam relaxes wrinkles without pressing. Hold the steamer six inches from the fabric and let the steam do the work. For stubborn creases, hang the coat in a steamy bathroom for twenty minutes. Resist the urge to press hard: wool recovers its shape slowly on its own.
Common questions
How often should I dry clean a frock coat?
Once or twice a year at most. Dry cleaning strips natural oils from wool. Daily brushing and airing matters more than periodic professional cleaning.
What is the best way to prevent moths?
Clean before storage (moths lay eggs on soiled wool), store in a breathable bag with cedar wood blocks or lavender sachets, and air the coat regularly. Avoid chemical mothballs.
Should I use a plastic garment bag?
No. Plastic bags trap moisture. Use a cotton or linen bag that breathes.
Can I wash a wool frock coat?
No. Wool coats cannot be washed. Water and agitation shrink and felt the wool. Dry clean only, and sparingly.
What is the biggest mistake with wool coat care?
Over cleaning. Most owners dry clean more often than needed. Daily brushing and airing extends the coat's life far more than periodic professional cleaning.