Bracketing wool coats: layering room under the shoulder

A wool coat fails in exactly one season: the coldest week of the year, when the knit underneath is at its thickest and the coat has to close over it. Every other week it fits. That is why the fitting room test has to be done in the worst case, not the average one. Put on the thickest sweater you will wear under the coat, then bracket two sizes over it.

The shoulder is the decision, as it is with every tailored layer. With the coat buttoned over the knit, cross your arms. If the back binds hard and the shoulder seam pulls inboard, that size is out, whatever the waist looks like. Then check the button. A single breasted coat should close without the front pulling into a V at the button. If it pulls, the chest is too small for the layer, and sizing up is the fix only if the shoulder still sits on the bone in the larger size.

The knit changes the size, not just the fit

A chunky knit adds roughly a full size of volume through the chest and shoulders. Shoppers who bracket a coat over a T-shirt and then wear it over a fisherman knit in January discover this in the worst way, standing outside in the cold with a coat that will not close. The bracket has to be done in the layer, or the bracket is fiction.

Try the larger size over the knit and the smaller size the same way. The keeper closes without pulling, lets you cross your arms, and still looks like a coat rather than a tent when worn over a shirt alone. If the larger size only works over the knit and swallows you over a shirt, you have a coat for three weeks a year and a tent for the rest of winter, and that is a real trade to weigh, not a detail.

Wool forgives less than you think

Wool has a reputation for forgiving fit, and it does, up to a point. The fibres relax and the coat moulds to the body over a season. What wool does not forgive is a shoulder seam in the wrong place, because the seam is structure, not fabric. A coat that is tight across the back over a knit will stay tight across the back over a knit, and the tailor who can fix it is rebuilding the coat, not altering it.

The economics cut both ways. A wool coat is the most expensive single item most shoppers bracket, and a returned coat costs the brand real money in inspection and pressing before it can be resold. The shopper who brackets once, over the right layer, and keeps the right size costs the brand one return leg. The shopper who guesses, wears it once in the cold, and sends it back costs the brand the coat's margin for the season.

The call to make

Keep the size that closes over your thickest knit without pulling and still sits right over a shirt. Send back the size that only fits in the mild weeks. A wool coat is a five year purchase. Fit it for the worst week, not the easiest one.

Keep reading: Bracketing hiking boots: toe box room on the descent, Bracketing denim: waist stretch on day two.

Frequently asked questions

Should I try a wool coat on over a sweater or a T-shirt?

Over the thickest sweater you will actually wear under it. A coat fitted over a T-shirt will bind over a knit on the coldest days, which is when you need it most. The fitting room test has to match the worst case.

How do I know if a wool coat shoulder fits?

The seam should sit on your shoulder bone with the coat buttoned over your layer. Cross your arms: if the back binds hard and the seam pulls inboard, it is too small. If the seam droops past the bone, it is too big. The waist and the button are secondary.

Will a wool coat stretch with wear?

A little, through the body, as the fibres relax. The shoulder seam will not move, and a tight back over a knit will stay tight. Buy the shoulder right and let the body settle.

Is it worth bracketing a coat in two sizes?

Yes, because it is the most expensive item most people bracket and the hardest to judge in one size. Two sizes, both tried over the same thick knit, and one decision on the shoulder. That is cheaper than a return in January.