The fastest way to choose a suede boot height is to look at what you already wear on the bottom half. If your fall uniform is a wide leg trouser or a straight jean, an ankle boot is the only height that disappears cleanly under the hem. If you live in midi skirts and dresses, a knee high closes the gap between hem and boot so you never see that awkward strip of shin. Over the knee is for short hems and for slim trousers you plan to tuck. Get that order right and the colour question answers itself, because suede reads softer than polished leather and a brown pair will do more work than you expect. Black is the one that goes everywhere. White, or the ivory and cream shades that stand in for it, is the wild card that makes a plain outfit look considered. Everything here is real suede, in brown, black or white, priced between $208 and $1,695. Nothing here is over $1,750, and every pair was checked on the retailer's own page before it went in.

Ankle boots and booties are the low risk buy, and they are also where the fit details matter most. A stiletto like the Schutz Mikki at $228 and a low block heel like the Prada pair at $1,650 sit at opposite ends of this grid, but both live or die on shaft height. Anything that ends at the narrowest part of your ankle lengthens the leg. Anything that ends higher, at the thickest part of the calf, shortens it, which is fine under a wide trouser and unkind under a skirt. Suede stretches slightly across the vamp and almost not at all around the shaft, so buy the shaft to fit and let the toe box relax. Then treat them. A protector spray before the first wear is the difference between a boot that survives three autumns and one that comes back from a wet Tuesday with a tidemark. Keep a suede brush by the door and use it dry. One more thing worth knowing: nap direction changes how the colour reads, so brush the whole boot the same way after every wear.

Knee high boots fail on circumference far more often than on length, and almost no retailer puts your calf measurement on the size chart by default. Measure the widest part of your calf, in the socks or tights you will actually wear, then check the shaft circumference on the product page and add room. Suede has give but it is not elastic. The Aeyde Medea at $208 and the Paris Texas Gaia at $1,220 are both slim shafts, so if you carry width, look for a back zip or a stretch panel rather than sizing up the foot. On colour, brown dominates this grid for a reason. A mid brown suede knee high goes with denim, navy, cream, grey and every shade of camel coat, and it looks less severe than black with a midi skirt. Wear them with the hem hitting just below the top of the boot, or fully tucked. The gap in between is the only version that never works. If you are between two shaft widths, the wider one wins, because a tight calf is the fault you cannot fix later.

If you are buying one pair this fall, buy the brown knee high. It is the height and colour that will get worn twice a week from October to March, and the mid range options here are genuinely as good as the expensive ones. Over the knee is the pair we love and wear least. It needs a short hem or a slim tucked trouser, it needs a flat or low heel to look current rather than costume, and it needs you to be honest about whether you will reach for it. Skip it if you are building a wardrobe rather than adding to one. White suede is the opposite bet, high impact and genuinely fragile, so only buy it if you will accept marks as part of the deal. And do not buy any of this without the protector spray. If you take one thing away, take a tape measure to the shop and measure your calf before you fall for a tall boot.