A kids oversized t shirt should sit past the shoulder and hang loose through the body, roomy enough to play in but not so big that the sleeves or hem get in the way of crawling, climbing or mealtimes. Start with your child's age band, check the size guide against a shirt that already fits, and go up one band if they are between two. For fabric, choose 100% cotton, which breathes on little skin through summers in Karachi, Lahore and Islamabad alike.
What oversized fit means on a child
On grown-ups, oversized fit means the shoulder seam is moved past the natural shoulder on purpose, with extra room cut in everywhere else. Our guide to fit types sets it alongside slim, regular and relaxed, and there is a separate explainer on the difference between relaxed fit and oversized if you want the adult version in detail.
On children, the same cut does a different job. Adults usually wear oversized for the shape. For kids it is practical: a dropped shoulder means arms can go up without the shirt pulling, a looser body leaves room over a nappy, and a bit more length keeps the back covered when a toddler bends down or plonks onto the floor.
Scale is what changes. On an adult, an oversized tee drops well past the shoulder and sits below the hip. Copy that onto a toddler and you would get sleeves hanging down the forearm and a hem near the knees. A good oversized tee for a child keeps that easy, relaxed shape while holding the extra room in check.
How to size a kids oversized t shirt
Kids' t-shirts are usually sized by age rather than by letter. COZY's But First Milk tee comes in nine bands, from 0-3 months up to 4-5 years. The band is a good place to start, but children the same age can be very different sizes, so use it as a guide and trust what you know about your own child.
The most reliable check is a shirt that already fits well. Lay it flat and measure straight across the chest from underarm to underarm, then from the top of the shoulder down to the hem. Compare those two numbers with the size guide on the product page. If the guide's chest width looks wider than your child's current tee, that is the oversized room built into the cut, and it does not mean you have chosen the wrong band.
If your child is between two bands, size up. That is the advice on COZY's kids product page, and it suits children who seem to grow overnight. One band up buys you more months before the shirt starts looking short, and since an oversized cut already has room in it, you will rarely need to go up more than one. The model on the But First Milk product page wears the 1.5-2 years size, if you would like a reference.
The same rule holds for grown-ups in COZY's oversized pieces: between two sizes, go up. It simply matters more for children, because a parent is picking for a body that will be bigger by next season.
How much room is too much
Some room to grow is lovely. Enough room to trip over is not. A few quick checks will tell you if a kids' tee has tipped too far.
Sleeves should finish right around the elbow. Any longer and they creep down the forearm, get pushed up all day and dragged through lunch. The hem should land around the hip or upper thigh. For a baby who is crawling, a hem near the knees catches underneath every time they move forward. The neckline should sit flat at the base of the neck. If it keeps sliding off one shoulder, the shirt is simply too big.
With babies and toddlers, think about getting the shirt on, too. Little ones rarely sit still for it, and a neckline with a bit of give makes mornings easier for everyone.
Frame size matters at any age. Smaller grown-ups run into a version of the same problem, which we cover in the best oversized fit for a petite frame. The idea carries over: the room in the cut should match the size of the person wearing it.
Why fabric matters more on a child's skin
A grown-up can tell you a shirt feels scratchy or sticky. A baby cannot. That is why fabric is the biggest decision with a kids' t-shirt, ahead of fit and well ahead of the print.
The But First Milk tee is 100% Cotton with no polyester, and the cotton is GOTS certified and ISO certified. GOTS, the Global Organic Textile Standard, looks at the whole textile supply chain and limits the chemicals and dyes used along the way, so parents get a fabric they can trace, with fewer unknowns. The dyes are high wash fastness, so the colour stays put instead of bleeding onto the rest of the laundry. The COZY Kids Collection follows the same thinking, using 100% cotton from GOTS certified suppliers.
Pure cotton also suits our summers, whether that means Karachi's humidity or the dry heat of Lahore and Islamabad. It breathes, and that matters in a loose cut, because air moving through the shirt is part of what keeps it comfortable. Synthetic blends tend to hold heat against the skin, and on a small child you see that quickly.
Looking after it is easy. Wash inside out with similar colours, hang to dry out of direct sun, and iron on the reverse rather than over any print or embroidery. No bleach and no tumble dryer. COZY fabrics do not shrink, so the size you choose is the size you keep.
The But First Milk tee is screen printed and finished with hand stitch embroidery, part of COZY's limited collaboration with Khwaab, and it pairs with a mama shirt like But First Coffee from the same Mothers Day Collection. Our guide to mommy and me matching shirts covers how to size the two together. To find the right size for your little one, start with the COZY Kids Collection and check the size guide on the product page.
