Rosetta | Women's Oversized Mock Neck Jumper
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An Oversized Mock Neck Jumper for Cold, Easy Days
This women's oversized mock neck jumper has that quiet, refined feel that lifts a simple outfit, with a soft high neck and a relaxed, roomy cut that drapes beautifully. Warm without any bulk, it works tucked into a skirt for something smarter or worn loose over trousers on a slow, cold morning.
Key Features
- Soft mock neck for warmth and a refined finish
- Relaxed oversized cut with an elegant drape
- Warm and cosy without the bulk
- Easy to dress up with a skirt or keep casual
Sizing tip: This jumper runs a little small, so we recommend going one size up
| Size | UK | Bust | Shoulder | Sleeve | Length |
|---|---|---|---|---|---|
| S | 8 | 116 | 57 | 52 | 64 |
| M | 10 | 120 | 58 | 53 | 65 |
| L | 12/14 | 124 | 59 | 54 | 66 |
Shipping & Returns
Free shipping on all United Kingdom orders.
Processing: 24–48 hours (orders placed on Friday evening start Monday).
Delivery: 6–12 working days.
Total shipping time: processing time + delivery time.
Returns: Not quite right? Return it within 30 days, unworn and in its original packaging. Returns are shipped at your own cost to our warehouse.
For full details, see our shipping policy. Any questions? Email us at support@byjefferson.com and we'll be happy to help.
Contact Us
Have a question about your order, sizing or anything else? We're happy to help.
Email: support@byjefferson.com
Phone: +1 573 304 5387
Customer service hours:
Monday to Friday | 09:00 – 17:00 (GMT)
Weekends | 11:00 – 17:00 (GMT)
We aim to respond to all enquiries within 24 hours. For quick answers, take a look at our FAQ page, or head to our contact page to get in touch.
Sizing
If you need more help with sizing, take a look at our size guide or email us at support@byjefferson.com.
Between sizes or unsure? We recommend sizing up.
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LOVED BY 17,000+ UK CUSTOMERS
Behind every order is someone we want to get it right for. Thoughtful design, honest sizing, and a team that answers. That's why our customers come back.
FROM THE CUSTOMERS
Was looking for the perfect Wedding guest dress, and I found multiple dresses! I just can't pick one, so highly recommend ordering. Everything is so nice.
Kate, 2026
Used the size guide before ordering and it was spot on. Perfect fit for your trousers. No guesswork, no returns. That alone makes By Jefferson ahead of most online menswear brands I’ve tried.
Clare, 2026
"If you're unsure about ordering, don't be. Clear communication, helpful customer service, and stunning clothing. My order arrived after 8 working days as promised, and I couldn't be happier with my purchase. I'll absolutely be back for more!"
Isla, 2026
"Such a great webshop! The clothing feels high-quality. I had a question about sizing and customer service responded quickly and very kindly, which immediately gave me confidence!"
Lynn, 2026
"I ordered a few shirts earlier this year and I’m really pleased with them. The quality is excellent and the fit is perfect; quite simply, it’s just a good product. I recently ordered a few more shirts!"
Lilly, 2026
From curious to confident
Frequently Asked Questions
Delivery is completely free within the United Kingdom on all orders. No minimum purchase required.
We deliver across the UK with free shipping on every order. Processing takes 2 to 3 working days and delivery a further 4 to 9 working days, so your order arrives within 6 to 12 working days of being placed.
You'll receive a tracking email the moment it ships, and any customs fees or import taxes are shown at checkout before you pay. For the full breakdown, see our shipping policy.
Absolutely. The moment your order ships, you'll receive an email with your tracking number so you can follow it right to your door. You can also track your order here at any time.
If the email hasn't arrived within 2 to 3 working days, check your spam folder or email us at support@byjefferson.com and we'll look it up for you.
Size up. Our items are designed with a bit of room to move, and if you're stuck between two sizes, the larger one almost always feels better. Still not sure? Email us atsupport@byjefferson.com with what you normally wear and we'll help you nail it.
We accept all major credit and debit cards, including Visa, Mastercard, American Express, Discover, JCB, Maestro and UnionPay. Your payment is processed securely before we confirm your order and prepare it for shipment.
For full details, see our payment policy.
Yes. All transactions are encrypted and processed through Shopify's secure payment system, which meets industry-standard PCI DSS compliance. We never store your payment information, and we don't sell or share your data with third parties beyond what's necessary to fulfil your order. Your information is safe with us.
30 days, no stress. If your order isn't right for any reason, send it back unworn and in its original packaging, and we'll sort it. Simple as that.
For the full process, see our return and refund policy.