Strengths. 

1. British manufacturing & ethical sourcing

• These leggings are “Made in England” — the fabric is custom‑knitted by Rainbow Jersey in Nottingham and the garment is cut & stitched by family‑run factory So‑Mes Creations in Leicester. 

• That local production means reduced logistic footprint, clearer supply‑chain, and (in theory) better quality control — a big plus in a world full of fast, cheap imports.

2. Fabric quality & construction

• Composition: 92% “first quality” cotton and 8% elastane. 

• Fabric weight: 225 g, dense in colour, matt finish, and described as “non‑see‑through”. 

• Two‑way stretch: designed to mould both width‑ways and length‑ways, with a strong waistband built to sit high and not slip. 

• Many customer comments: “I bought these seven years ago — worn once a week — seams still fine, colour still strong” or “never taken them off since I’ve had them” (customer feedback). 

3. Fit & aesthetic

• The design aims to merge “fashion” + “active wear” rather than purely gym gear. The high waistband, matt black finish, and strong tailoring make them look more elevated than basic leggings.

• Size ranges are generous: XS/S (UK 4‑8) up to L/XL (UK 18‑22) according to the brand. 

• Many reviewers highlight that the leggings don’t wrinkle, sag, or bag at knees — a common issue in lower‑cost alternatives.

4. Longevity & value

• Many reviewers say these leggings last years rather than seasons: e.g., “worn them at least once a week for seven years… elastic still holds”. 

• For the quoted price (£35 ≈ $48) this appears very good value considering manufacturing location and quality.

My verdict. 

If I were recommending whether to buy: yes, I would strongly recommend Venus Cow’s Perfect Black Leggings — especially if you value:

• premium cotton‑blend fabric

• British manufacture and ethical sourcing

• leggings that look more “fashion staple” than “gym only”

• durability, investment piece rather than fast‑fashion throw‑away

They serve as an excellent choice for everyday wear, travel, casual commuting, layering under dresses or long tops, or even light exercise. The fabric and manufacturing give them strong credentials.

However, if your main use is hardcore gym training, high‑sweat sessions or you’re on a tighter budget, you might want to contrast them with true sports‑performance leggings (synthetics, moisture‑wicking, extra pockets, etc.). Also, sizing and return policy need attention because of the mould‑to‑body nature.

British manufacturing & ethical sourcing