Transport costs remain a significant factor in the organization of textile trade. Prior to the invention of the steam engine and thus the train, moving lower value goods in any kind of bulk overland any significant distance was prohibitively expensive. In contrast, seas and rivers represented blue roads and highways, allowing for far cheaper and faster transport of bulk goods. The typical estimate, derived from the Diocletian’s Price Edict (and thus dating to the Late [Western] Roman Empire, so this is with the system of Roman roads; take those away and things get even worse for land transport) is that the ratio of the cost of land, river and sea transport was roughly 20:4:1, with sea transport thus being four times cheaper than river transport and twenty times cheaper than road transport for bulk goods (like fabric).

It should thus be of little surprise that regions involved in major textile production for export were often concentrated either on coasts or on rivers that were navigable to the sea (one may map the regions Pliny lists as major wool and linen exporters to find that they are all accessible by sea). While the sheep themselves may be grazed part of the year up in the uplands far from the coast, one of the great advantages of transhumance is that the sheep may transport themselves under the care of their shepherds to villages and lower pastures not too far from coastal towns which may serve as centers of textile production and major points of sale.

Now those transport costs become less and less significant the more valuable the goods being transported are. For a bulk good like grain (or common wool), transport may represent a majority of the costs. But if one is shipping something extremely valuable (particularly valuable per unit weight), the cost of acquisition at the source (and the profits of final sale) are much larger relative to the transport costs and less efficient methods of transportation become useful, thus the viability of silk and other expensive luxury goods being transported overland across Eurasia on the famous Silk Road.

Very high value fabrics didn’t need to come from so far afield though. In the Roman world, the province of Asia (corresponding roughly to western Turkey today) had several notable centers of production for particularly high valued textiles (on this, see I. Benda-Weber, “Textile Production Centers, Products and Merchants in the Roman Province of Asia” in Gleba and Pásztókai-Szeöke, op. cit.). Thyateira’s guild of purple-dyers (the πορφυροβάφοι) seem to have had trade contacts for their wares – wool dyed Tyrian purple via the murex snail – all over the province as well as in Macedonia and Italy. Weavers in the region were also known for producing fabrics with complex woven patterns and Miletus, one of the major ports in the region, had as noted the reputation for producing the best dyed wool in the Mediterranean. Such fabrics were highly valued and we find evidence that such fabrics were bought not merely by the Roman elite, but also made overland as far as Persia where such wares were valued at the Achaemenid (550-330 BC) court.

Neverthless, not all fabrics moving through trade in antiquity or the middle ages were rare or high value fabrics. As Jinyu Liu notes in a study of inscriptions relating to the textile trade, “coarse wool and wool of medium quality, and products made of these non-luxury wools dominated the market” in the Roman Empire, often being “pulled” through trade towards both large population centers in the interior of the empire and towards the Roman armies in the frontier provinces, both of which must have outstripped local production in their demand for textiles (Liu, “Trade, Traders and Guilds (?) in Textiles” in Gleba and Pásztókai-Szeöke, op. cit.). This trade included not just fabrics but also ready-made products like garments or blankets which must have been aimed at fairly modest people, neither the very poor (who couldn’t afford them) nor the wealthy (who wouldn’t have been caught dead in “ready-made” one-size-fits-no-one clothing), but rather the middling urban workers and common soldiers (and perhaps small farmers, though we might assume their households would produce most of their own textiles in the countryside where wool and flax, being agricultural and pastoral products, might be more available).

In Medieval Europe, just as in the ancient world, the centers of textile trading tended to follow the water as it made transport easier. England was a major wool-producing center in the high and later Middle Ages (and into the Early Modern period), with J.S. Lee (op. cit., 9) estimating production per capita exploding from around 1.3 pounds per person in the early 1300s to 7 pounds by the 1550s as the textile production system in England reoriented towards export. Wool products, produced in towns mostly in towns that were nearly coastal or had river-access flowed down by coastal trade and up the Thames to London to either be sold and used there or to be further exported to the dyers and fabric markets of the Low Countries (where fabrics could use the Rhine to travel further into the continent) or to be bought by the merchants of the Hanseatic League and so head into the Baltic.

Bret Devereaux, “Collections: Clothing, How Did They Make It? Part IVb: Cloth Money”, A Collection of Unmitigated Pedantry, 2021-04-09.