Online activewear sizing charts use centimetres, and no two brands round the same way — get it wrong and you're stuck mid-lunge in leggings you can't actually train in. Here's how to pick the right size activewear for training so the fit holds up past your warm-up, not just in the mirror.

Why This Matters

Activewear sizing across Australian retailers runs from AU 6 to AU 22, and a size 12 top from one brand can measure 4cm different from a size 12 top somewhere else. Guess wrong on training gear specifically and you feel it fast — a legging that's too tight restricts your squat depth, and one that's too loose bunches at the knee during a run.

At Hot Deal Warehouse, activewear sizing gets treated the same way as any other purchase decision: check the numbers, not the label. A size chart in centimetres beats a guess based on your usual jeans size every time, and it takes about ten minutes to do properly.

What You'll Need

• A soft fabric tape measure (not a rigid one)
• Your bust, waist and hip measurements in centimetres, taken today, not from last year
• The specific brand's size chart, not just a generic S/M/L guess
• Two or three pieces you'd actually train in — leggings, a sports bra, a singlet
• Ten minutes and a mirror to run the squat-and-reach test before your first session

The Steps

1. Measure your body in centimetres, not your usual size

Wrap the tape around the fullest part of your bust, your natural waist, and the widest point of your hips. Write the three numbers down in centimetres, because that's what every activewear size chart in 2026 actually uses, whatever the S/M/L label says on the front.

The common mistake here is measuring over thick clothing or pulling the tape too tight — both shave centimetres off and push you into a size that's too small once you're actually training in it.

2. Match your numbers to the brand's actual size chart

Every brand builds its own chart, and a size 14 at one retailer can sit closer to a size 12 or 16 somewhere else. Line your three measurements up against the specific product's chart rather than assuming your size carries across.

If your hip measurement lands you in a 14 but your waist sits in a 12, size up for bottoms and size to the smaller number for tops — that's the fix, not splitting the difference and landing wrong on both.

3. Match fabric stretch to your training type

Compression fabric with 20-30% stretch works for weightlifting and HIIT, because it holds its shape under load without bagging at the knee. Looser four-way stretch blends suit yoga, pilates and running, where range of motion matters more than hold.

Browsing activewear sets for beginners at the gym before you buy gives you a sense of which fabric weight matches which training style, rather than picking on colour alone.

4. Run the squat-and-reach test before you commit

Once the item arrives, squat down fully and reach overhead in it for about 30 seconds before you cut any tags off. A well-fitted legging won't roll down at the waistband or go see-through across the seat, and a well-fitted top won't ride up past your midriff when your arms go up.

The common mistake is judging fit standing still in front of a mirror. Activewear for training has to pass the movement test, not the standing test.

5. Check waistband height and gusset placement

A training waistband should sit 2-3cm below your belly button and stay there through a full set of lunges. If it's digging into your ribs or sliding down past your hips within five minutes, you've got the wrong rise, not necessarily the wrong size.

Check the gusset seam too — it should sit flat against your inner thigh, not bunch or pull, especially in leggings built for squats and deadlifts.

6. Split sizes between top and bottom if you straddle two ranges

If your measurements fall between two sizes on the chart, don't force one number to cover both a top and a bottom. Buy the top in the size that matches your bust and shoulder measurement, and the bottom in the size that matches your hip and waist — they're rarely the same number once you're outside the middle of the size run.

Activewear worth trying on

Pump It Up Set — Women's Matching Activewear Co-ord Set

A coordinated top and bottom built to move with your body through training.

A$79.95

Estelle Yoga Suit — Women's Two-Piece Activewear Set

A two-piece set designed for free movement without sacrificing shape.

A$89.95

Lets Get Physical Set — Women's Bold Matching Activewear Set

A bold coordinated activewear outfit built for training sessions.

A$79.95

Multicolor Tie Dye Hollow Out Fitness Activewear Leggings

Hollow-out detailing with the hold you need for a full workout.

A$49.95

Troubleshooting

Waistband rolls down mid-squat. The rise is too low or the fabric has lost stretch recovery — size down one and check the fabric blend has at least 15% elastane.

Leggings go see-through at the seat during a squat. The fabric is too thin for compression work. Look for a heavier blend rated for training, not lounging.

Sports bra straps dig in within a set. The band size is too small even if the cup feels right. Go up one band size and keep the same cup.

Chafing at the inner thigh after a run. The gusset seam is sitting wrong, usually because the size is a touch too big and the fabric shifts. Size down and check the inseam length matches your height.

Stuck between two sizes on the chart. Measure again at the end of the day, not first thing in the morning — waist and hip measurements shift slightly through the day, and training gear needs to fit at both ends.

Tools and Resources

• A soft tape measure and a note of your bust, waist and hip measurements in centimetres
• The brand's specific size chart, checked against your numbers every time you buy a new style
• Budget gym leggings for women in Australia if you're building out a training wardrobe on a budget
• Men's gym clothes for training in Australia for fit guidance on the men's side
• The squat-and-reach test, run every time before you cut the tags off

What to Do Next

Once your training basics fit properly, the next thing worth sorting is your running and outdoor kit, since the fit rules change again once you're covering distance instead of lifting.

FAQ

One Last Thing

Most sizing complaints on activewear aren't really about the number on the tag — they're about rise and gusset placement, which two identical-sized items can get completely differently. Check those two details specifically before you look at the size label at all, and the label stops mattering nearly as much.

Related Guides

• Cheap activewear for women on a budget
• Shorts and leggings for running
• Activewear for hiking and trail walks
• Best leggings for yoga and pilates