garment-attributes

Multi-label classification of fine-grained garment construction attributes from a garment crop: silhouette, length, neckline/collar/sleeve/pocket type, opening/closure type, waistline, textile pattern, finishing techniques, and fabric appearance. SigLIP2 vision encoder (Apache 2.0) with a classification head, fine-tuned on per-instance attribute annotations from Fashionpedia (CC BY 4.0).

Label space: the 218 Fashionpedia attributes with ≥100 training instances (the full list with supergroups and support counts ships in label_space.json and in config.json id2label). Attributes map to tech pack fields — e.g. opening type → construction/closure, textile pattern → BOM/fabric — per the pipeline's docs/taxonomy.md.

Loads with stock transformers — no remote code:

from transformers import AutoImageProcessor, AutoModelForImageClassification
import torch
from PIL import Image

model = AutoModelForImageClassification.from_pretrained("resoa/garment-attributes")
proc = AutoImageProcessor.from_pretrained("resoa/garment-attributes")
img = Image.open("garment_crop.jpg")  # crop of ONE garment, not a full scene
probs = torch.sigmoid(model(**proc(images=img, return_tensors="pt")).logits)[0]
for i, p in enumerate(probs):
    if p > 0.5:
        print(model.config.id2label[i], round(p.item(), 3))

Intended use

• Estimate visible construction characteristics of a manufactured garment from a photo (crop the garment first — use garment-detector-seg).
• Cross-check a sample against tech pack attributes ("single-breasted", "welt pockets", "no distressing").

Important: input must be a single-garment crop. Full-scene inputs degrade accuracy sharply; that is what the detector stage is for.

Out of scope: fiber content, GSM, measurements, stitch class, color (color is measured deterministically in the pipeline, not classified).

Training

• Base: google/siglip2-base-patch16-224 (Apache 2.0).
• Data: 156,937 Fashionpedia per-instance crops with attribute labels (scripts/prepare_attribute_data.py; 8% bbox padding, min crop 48 px, attributes with 100+ train instances).
• Objective: sigmoid BCE (problem_type="multi_label_classification").
• Recipe: scripts/train_attributes.py with configs/attributes_mac.yaml (4 epochs, batch 32, lr 2e-5, cosine schedule, trained on Apple-silicon MPS in ~4.5 hours; val metrics improved monotonically each epoch).

Evaluation (Fashionpedia val2020 instances)

Read the per-attribute table (per_attribute.md, shipped in this repo) before using any single attribute for QC decisions: performance varies widely by attribute, and rare attributes (support near the cutoff) can be substantially weaker. We publish the full table, including the bad rows, on purpose.

Known limitations & biases

• Multi-label confidences are not calibrated probabilities; the reference pipeline routes 0.5–0.7 confidence predictions to human review.
• Absence of a prediction is weak evidence of absence (occlusion, angle).
• Trained on worn-garment street photos; flat-lay/factory photos are out-of-domain — fine-tune on in-domain crops for production use.
• Attribute definitions follow Fashionpedia's expert ontology, which may differ from a specific factory's terminology; the supergroup mapping in label_space.json is the bridge.

License & attribution

Weights: Apache 2.0. Data: Fashionpedia, CC BY 4.0 — cite Jia et al., ECCV 2020. Base model: SigLIP2 (Google, Apache 2.0), Tschannen et al., 2025.

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Measured: crop padding and multi-crop inference

The warning above ("full-scene inputs degrade accuracy sharply") has now been quantified on this model's own evaluation protocol — Fashionpedia val2020, 3,711 instances, 212 evaluable labels, 48-pixel minimum crop. Only the crop padding varies; preprocessing, threshold and metric are unchanged.

"Sharply" is −86%: a full scene retains 14% of trained-crop mAP.

Two free improvements, no retraining

1. Widen the crop to 0.25 padding. It beats the 0.08 used in training by +3.0% macro-mAP (+0.0132 absolute; bootstrap over 3,711 instances, 400 resamples, P(>0) = 0.98).

Where that gain comes from, per instance category (same bootstrap; only categories with n >= 100 shown, and only three of thirteen show a real effect):

So 0.25 is the right global default, but the benefit is concentrated in sleeve, collar and skirt crops and is neutral elsewhere — it is not worth tuning padding per category.

2. Average over several crops. Running the model on more than one padding of the same instance and combining:

Two crops at 2× inference cost gives most of the gain. Do not include the 1.00 padding — past the 0.50 cliff it costs more than it adds.

Measurement caveat: this harness reproduces the published protocol's instance and label counts exactly (3,711 / 212) but scores ~1–2% below the headline figures (0.6995 vs 0.7100 micro-F1), most likely crop-rounding or resize detail. The comparisons above are all relative to this harness's own 0.08 baseline, so that offset cancels; read the absolute numbers as ~2% low.

If you cannot control the crop

resoa/garment-crop-gate-nano is a 47K-parameter, 188 KB pre-flight gate that predicts whether a crop is tight enough to trust. On variably-cropped input it lifts macro-mAP from 0.3124 to 0.5012 (+60%) by declining roughly half the inputs — 96% of what a perfect gate would deliver. It refuses; it does not repair.

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Structural note: this label space spans garments AND garment parts

Fashionpedia annotates instances, and its 46 categories include garment parts (sleeve, pocket, collar, lapel, neckline) alongside whole garments (dress, coat, jacket, pants). Training crops therefore come at two very different scales. Median instance area as a fraction of the source image:

Two consequences worth knowing:

1. "Crop the garment first" is ambiguous. A welt (pocket) label was learned from crops of pockets, roughly 0.3% of the source frame — not from whole garments containing pockets. Feeding a whole jacket and reading the pocket-type outputs asks the model about a scale it mostly saw in isolation.

2. The nickname attributes never co-occur. Measured over 206,212 training annotations, instances carry a mean of 1.012 nickname attributes, and cross-group co-occurrence is exactly zero — no instance has both a sleeve style and a pocket style. That is not a fact about garments (a blazer has both); it follows from parts being annotated as separate objects. Treat the nickname group as one attribute of whichever part this crop depicts, not as a set of independent garment properties.

A derived 13-group sub-taxonomy of the 96 nickname attributes — sleeve, pocket, collar, lapel, dress, top, jacket, coat, pants, skirt, shorts, shirt, t-shirt — is published in nickname_taxonomy.json. Each group maps 1:1 to a Fashionpedia category, and within-group exclusivity runs 0.944–1.000.

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A retrained variant is available

resoa/garment-attributes-v2 is this model retrained with crop-scale augmentation (25% padding, ±10% jitter, horizontal flip) — same architecture, label space and hyperparameters otherwise.

Macro-mAP 0.4355 → 0.4850 (+11.4% relative, P(better) = 1.00), micro-F1 0.7006 → 0.7244, on this model's own val protocol. It wins at every evaluation padding and is markedly more forgiving of loose crops (0.4647 vs 0.3842 at 0.50 padding). 172 of 212 labels improve, with the gain inversely proportional to training support — +0.0834 mean AP for attributes with 100–300 training instances against +0.0197 for those above 5,000.

Ablation attributes the gain: scale jitter +0.0302, padding value +0.0191. The augmentation matters more than the padding value it was introduced alongside.

Known failure modes, measured

• Small features are not resolvable. 19 of 202 attributes have a diagnostic feature under 2 pixels at this input size; metal (5 mm) scores AP 0.072 despite 1,135 training examples, and bead(a) 0.133 despite 2,030. No amount of data fixes a one-pixel feature.
• Rare attributes are weak. Mean AP 0.358 for attributes with 100–300 training instances against 0.770 above 5,000.
• Loose crops collapse it. A full scene retains only 14% of trained-crop mAP.
• Regressions from v1 exist and are shipped in per_attribute_v2.json — tuxedo (jacket) 1.000 → 0.200, collarless 0.688 → 0.511.