Rule for printing the name of a torso: say "[garment type]".
A torso is a kind of thing. A torso is always wearable. Understand "shirt" or "blouse" as a torso. A torso has a garment type. Understand the garment type property as describing a torso. A sleeve is a kind of thing. A short sleeve is a kind of sleeve. A long sleeve is a kind of sleeve. A collar is a kind of thing.
Understand "sew [something] to [something]" as affixing it to. Affixing it to is an action applying to two things. Carry out affixing something to something: now the noun is part of the second noun. Report affixing something to something: assign identities; say "You sew [the noun] on, creating [a second noun]." Understand the command "stitch" as "sew".
Instead of affixing something to something when the second noun is worn: say "You're wearing [the second noun]!"
Instead of affixing a torso to something:
if the second noun is a torso, say "Couture for Siamese twins is a daring field, but a bit of a niche market.";
otherwise try affixing the second noun to the noun.
Instead of affixing a sleeve to something when at least two sleeves are part of the second noun: say "[The second noun] already sports [a list of sleeves that are part of the second noun]."
Instead of affixing a collar to something when a collar is part of the second noun: say "[The second noun] already sports [a list of collars that are part of the second noun]."
Instead of examining something when something is part of the noun: say "Stitched to [the noun] [is-are a list of things which are part of the noun]."
Here is where the issue of precedence arises. We want to encourage Inform to select a cuttable object that is part of something else, rather than one of the spares:
{**}Definition: a thing is removable if it is part of something. Understand "cut [removable thing]" as cutting.
The Boutique is a room. "Still festively strewn with the confetti and streamers of the Grand Opening party, and still almost totally customer-free."
The player carries a torso. The player carries three short sleeves. The player carries two long sleeves. The player carries two collars.
Test me with "sew collar to shirt / i / sew short sleeve to shirt / g / i / x polo shirt / cut collar / i / cut shirt / sew long sleeve to shirt / i / sew long sleeve to shirt / i / sew collar to shirt / g / i / wear button-down".