How to Style FORM Matching Sets in 2026: Five Ruby, Moss and Stripe Looks From Joinform
You catch your reflection in the studio mirror between sets: deep ruby leggings, a bra in the exact same red with a terracotta layer peeking out at the neckline. Nothing about it was hard. You didn't hunt for "a black that matches the other black." You just picked a color and wore all of it.
That's the quiet magic of FORM's activewear. Almost every bra, legging, short and tank at joinform.com shares one 75% polyester / 25% spandex fabric and a tight color palette, so pieces were designed to be worn as sets. SweatproofGear pulled five set formulas from FORM's newest drops in October 2026, with the support labels, size runs and prices printed on each product page.
Who This Style Guide Is For
- The matching-set person who feels more motivated when the outfit is put together.
- The studio-to-errands crowd who want activewear that looks intentional at the coffee shop afterward.
- The FORM member who already follows the workouts and wants the wardrobe to match the routine.
The Rule FORM's Sets Are Built On
FORM product pages say it directly: the Core Shorts are "perfect for pairing" with Core tanks "for a matching set look," and the newest colorways (Ruby, Moss, Navy/White, Butter Stripe) were released together across bras, leggings, shorts, tanks and lounge tops. Pick one color story, then choose each piece by the job it has to do. Support level picks the bra. The workout picks the bottom length.
Set 1: Ruby, Head to Toe, for High-Energy Days
This is the set from the opening scene. The Halter Layered Bra ($76) has two fully lined layers: the top one with a halter strap and princess seams, the bottom with adjustable straps. FORM lists it as high support and medium coverage, for cups AA–D. Underneath the ruby top layer, the terracotta bottom layer adds a flash of contrast.
The Core Leggings in Ruby ($88) bring the extra high-rise waistband designed to stay put during movement, no front rise seam and a full-length 27" inseam that hits at the ankle. They run XS to XXXL. Together the set comes to $164.
Wear it for: strength circuits and cardio days when you'd rather not adjust anything mid-class.
Set 2: Ruby Shorts for Pilates and Warm Studios
Same color, lighter feel. The Straight Neck Bra ($68) has a modern straight neckline with bold navy contrast binding, thicker adjustable straps and a compact cup shape. It's rated medium support and medium coverage, and the brand describes it as "studio-to-street." The Core Shorts 5" ($74) sit above the belly button with a seamless front rise, in XS to XXXL.
Navy binding on a ruby bra means you can also swap in navy shorts from FORM's core range without breaking the look. Total for the set: $142.
Wear it for: mat Pilates, hot rooms and summer-in-October afternoons.
Set 3: Moss and Lemon for Everyday Training
If red feels loud, moss is the calm alternative. The Core Leggings in Moss ($88) share the Core features above, in XS to XL for this colorway. Pair them with the Reversible V-Neck Bra in Moss/Lemon and Navy/Lemon ($78), which FORM builds on its V Neck Bra silhouette, with "buttery-soft" fabric on both sides, a V neckline and medium support and coverage.
The reversible part is the styling trick: wear the moss side for a tonal set, flip to navy on a day you want contrast. One bra, two outfits, $166 for the pair.
Wear it for: mixed classes where you go from weights to stretching in one session.
Set 4: Butter Stripe for After Class
Not every set is for sweating. The Raglan Crewneck in Butter Stripe ($118) is 100% cotton in what FORM calls ultra-soft lounge fabric, with a fitted long-sleeve shape, a functional front button placket and button details along the sleeves. The Drawstring Mini Shorts ($72) are lightweight cotton fleece with a mid-rise waistband and a self-tie drawstring.
Pull the crewneck over your sports bra after class and you're dressed for brunch. Wear the full stripe set on a slow Sunday. It's the softest way to stay in the FORM look all day.
Wear it for: the walk home, the coffee run, the couch.
Set 5: The One Layer That Goes Over Everything
The uniFORM Zip Up ($142) is a vintage-inspired French terry hoodie in 100% cotton, cut oversized, with an oversized hood, front pockets with contrast stitching, a FORM patch at the chest and ribbed cuffs and hem. Heather grey with navy details sits neatly over every set above, ruby included. When we checked, only sizes L and XL were in stock in this color, and because the fit is oversized, many shoppers can wear a larger size anyway.
Four More Pieces to Complete a FORM Set
From FORM's latest colorways, with the prices shown on joinform.com in October 2026.
Prices change often; the brand's site always shows the current price.
Set Builder Cheat Sheet
| Set | Bra / top | Bottom | Support | Total |
|---|---|---|---|---|
| Ruby high-energy | Halter Layered Bra | Core Leggings | High | $164 |
| Ruby studio | Straight Neck Bra | Core Shorts 5" | Medium | $142 |
| Moss everyday | Reversible V-Neck Bra | Core Leggings | Medium | $166 |
| Ruby slow flow | Knot Bra | Core Shorts 5" | Low | $146 |
| All-in-one | FORM Cami (shelf bra) | Core Leggings | Medium | $160 |
| Butter Stripe lounge | Raglan Crewneck | Drawstring Mini Shorts | — | $190 |
Free U.S. shipping starts at $250 (the site notes exclusions apply), so a full set plus the zip-up or a second bra usually gets you there.
Three Styling Tips Straight From the Labels
Match support first, color second
Each bra page lists support and coverage. A gorgeous low-support Knot Bra still isn't the one for jump squats, so pick the support level, then find it in your color.
Use contrast binding as a bridge
The Ruby/Navy and Moss/Lemon pieces carry a second color in the binding or reverse side. Repeat that color in another piece and mismatched sets suddenly look planned.
Size the tanks like FORM says
The V Layered Tank and Layering Tee pages say "designed for a fitted look," and FORM's advice on both is to size up if you're between sizes. The bras, leggings and the FORM Cami are listed as true to size.
Style Guide FAQ
Are FORM sets sold as bundles?
The pieces we looked at are sold separately, so you can mix any bra with any bottom.
Do the new colors come in extended sizes?
Some do. The Ruby Core Leggings, Ruby Core Shorts 5" and the FORM Cami run to XXXL; several bras in the new colors stop at XL.
Can I return a set if the colors don't work?
FORM's refund policy gives domestic orders 14 days after delivery to request a return, unworn with tags. Sale items and gift cards can't be returned.
How long does shipping take?
The shipping policy asks you to allow 7–10 days.
The Takeaway
FORM's real styling secret is restraint: one fabric, a short list of colors, and support labels that tell you which piece fits which workout. Pick a color story, choose the bra by support and the bottom by the class, then add one cozy layer for after. Check our FORM deals page before you build your first set.
How we wrote this: SweatproofGear researched FORM (joinform.com) using its official website, product listings, prices and policies in October 2026. We haven't personally tested these products and we don't invent ratings or discount codes. We may earn a commission if you buy through our links, at no extra cost to you.