Some clothing-related stuff from the Innovations plan.
Livery: A social trend wherein certain groups (such as the members of a related clan, or a religious sect, or a certain guild, etc.) prefer to wear clothing of certain specific colors, and discourage the use of those colors by those
outside the group. Less formal than an actual uniform, although they may indeed
be uniforms in some cases. One well-known example is in Zeffirelli's film of
Romeo and Juliet, wherein both families--and their servants, retainers, & friends--each had their own livery.
Stripes (a): By using threads of different colors for the
warp threads, a weaver can produce cloth with
longitudinal stripes.
Stripes (b): By using threads of different colors for the
weft threads, a weaver can produce cloth with
latitudinal stripes.
Plaid: If both variations of Stripes are known, a weaver can combine them to produce plaid fabric.
Tartan: If both Plaid and Livery are known, certain social groups may adopt specific patterns of plaid as their own.
Tie-Dye: Could definitely be a thing, although its abstract and unpredictable nature might make it more appealing to elves than to dwarves.
Pockets: Also very doable, and important--both as folds of cloth sewn into garments, and also as leather pouches attached to belts. Would not increase hauling capacity (except for small things, like seeds), would primarily store personal possessions.
Cushions: Increases the value (both monetary and comfort) of furniture like beds & chairs, armor such as helmets, and also allows the creation of "cloth armor" items, such as padded gambesons. Why the
hell does my computer's spell check know "Zeffirelli" but not "gambeson"?
Printed cloth: Historically beyond the tech cutoff date, but still feasible IF Toady decides that certain dyes can be developed that can be used when they are nearly dry--if they're wet, the color will simply bleed everywhere immediately & the design will be lost.
Along with tassels, consider
Fringe.
Plus all of the dozens (hundreds?) of new dyes that would come from all of the various animal, mineral, and (mostly) vegetable sources now in the game.