I am xs-s in csb
"I am xs-s in csb pieces, bought this in xs and the fit is just right. I have quite slim arms and small waist otherwise I would size up. Love the quality, doesn’t feel flimsy"









for all orders over $150 (USD)
within 30 days (exclusions apply)
A winter wardrobe staple! Our longline zip up jacket contours the waist in buttery soft Serenity fabric. Perfect for layering over your favourite CSB crop to get you through the chilly season
80% Polyester, 20% Elastane
FREE SHIPPING ON ORDERS OVER $150 USD
Enjoy free standard shipping on all orders with a merchandise subtotal of $150 USD or more. Eligible orders will automatically receive a free shipping option at checkout.
Shipping costs for orders below this threshold are calculated at checkout based on your delivery location and parcel weight.
Duties and taxes are prepaid where available. If included, your selected shipping method will display "Duties & Taxes Prepaid" at checkout.
If this label is not shown, any applicable duties, taxes, or import fees will be payable by the recipient upon delivery.
30-DAY RETURNS
We want you to love your CSB pieces. If something isn't quite right, you can return eligible items within 30 days of delivery for a refund, store credit, or exchange, subject to our return policy.
Refund Eligibility
Please view our full Returns Policy here.

Overall rating: 4.8320312 / 5 from 256 reviews.
The Serenity Longline Zip Up Jacket is highly praised for its buttery soft fabric, perfect fit, and flattering design. Customers love its luxurious feel and high-quality material, though some noted the absence of pockets.
Review topics: ["size","fit","look","colour","length","quality","waist","zip","fabric","design","material","stretchy","shape","feel","cut","piece","sleeves","jacket","wear","thumb holes","compression","snatches","duper","csb","medium","hugs","set","compliments"].
"I am xs-s in csb pieces, bought this in xs and the fit is just right. I have quite slim arms and small waist otherwise I would size up. Love the quality, doesn’t feel flimsy"
"I would definitely size up! I love the color material and quality! would buy agian in all colors!"
"I love this zip!! so stunning and so flattering. The perfect off-white shade. Got so many compliments on it. One thing I will say is it does fit very tight! I would recommend sizing up if you don’t want a super compressed fit. I’m usually a size small and a B cup. I don’t mind the compressive fit so I stuck with a small."
"Gorgeous work out jacket. I have it in all colors and multiple in black. It is just perfect to wear over a sports bra if it is a little chilli outside. You can always wear it open if it is warmer and I even found I can run with this jacket on a cold day. The fit and the length are just the perfect combo to flatter a woman’s body."
"So flattering. I will say size up because it is very very fitted and compressive! I got a small (usually a true small) & I’m a smaller C cup. Still so flattering and I’m in love"
"“The CSB Serenity jacket is super flattering and comfortable 🤍 The fabric feels soft and lightweight while still giving a snatched fit. Perfect for Pilates, errands, or everyday athleisure wear."
"i want this in every color! Definitely size up from your regular size it runs very small but makes you look snatched and confident- i want it in every color!"
"I was hoping for more but it didn’t provide the snatched look I wanted"
"Confusing sizing. I have this in medium in black and a large in buttercream. While the black is flattering, it just feels too fitted. I am surprised that the large fits exactly like the medium."
"Excellent quality! Fits so well. Love how versatile this jacket is. I would say that it fits smaller. Initially I ordered a XS (my usual size) but I had to exchange it a size Small."