Introduction Finding the right size for a longline nursing tank starts with your underbust and bust measurements, then aligning them with how you want the fit to feel. This guide walks you through measuring, understanding how the tank fits across the torso, and making an informed size choice when your underbust is 90 cm. We’ll cover fit descriptions, sizing recommendations, common issues, and what to do if you’re between sizes.
Sizing Answer (direct recommendation)
- If your underbust is 90 cm, you’re typically in a band size around 34 in US sizing or 75–76 cm in European sizing, depending on the bra sizing system you’re used to. For a longline nursing tank that’s designed to sit under the bust with a longer torso length, use your bust measurement to choose between snug, comfy, or relaxed fits. If you are between sizes, consider the following rule of thumb: choose the size that aligns with your bust measurement first and accept a slightly tighter band if you want a more secure feeling, or size up for easy layering and movement. Since fabrics can have slight stretch, a little flexibility is normal.
Customer Questions (actual questions from the user)
What size longline nursing tank should I get? My underbust is 90 cm. What size should I wear? Should I size up or down if I’m between sizes, and does fabric stretch affect the fit?
How It Fits (real terms)
- Longline nursing tanks are designed to sit beneath the bust, with a longer torso to provide coverage and support while feeding. The Emama Black Long Line Nursing Crop typically features a band that sits snugly around the underbust area, with the fabric extending downward to create a longline silhouette. Expect some stretch in the material, which helps accommodate gentle movement and changes in posture.
- If you prefer a snug feel you can opt for your bust measurement as the main guide and choose a size that feels firm at the band. If you want more ease for lounging or casual wear, a comfy or relaxed fit will give more room through the torso and chest without feeling tight.
- Length may vary slightly by size; for reference, a true longline design will stay under or around the ribcage area and not ride up when you move or nurse.
Size Recommendations (tables and guidance)
- Quick sizing approach based on underbust 90 cm:
- US/NUS size: 34 band with consideration for cup/bust measurement. If you have a larger bust, you might prefer a size that accommodates your bust while keeping the band comfortable.
- EU size: 75–76 cm underbust alignment corresponds to a 34 band in many European systems.
- How to pick by fit preference:
- Snug/firm support: Choose a size that matches your bust measurement most closely while ensuring the band sits firmly around the underbust with minimal roll.
- Comfy: If you’re between sizes or want a bit more room, choose the larger option to allow for easier movement and grabbing during nursing.
- Relaxed: For layering or if you want maximum ease, size up and accept a looser band with more drape through the torso.
- Practical example (for 90 cm underbust): If your bust measurement is around 88–96 cm (roughly a B–C cup range, depending on brand), you’ll likely be comfortable in a size that keeps the band snug but not digging in. If your bust is larger, consider the next size up to prevent the fabric from pulling at the bust line.
Body Type Guidance (what to consider)
- Short torsos: A longer torso in a longline tank may reach further down, so you may prefer a size that sits higher to prevent the garment from wrapping around the hips.
- Taller frames: The longline length will be more pronounced; ensure the torso length aligns with your waist-to-hip area to avoid excessive fabric pooling.
- Athletic or full bust: A snug band around 90 cm underbust should feel secure yet breathable; if you feel the band digging or riding up, you may need to size up and rely on the fabric stretch for snugness.
Common Fit Issues (watch out for these)
- Band too tight: Digging underbust, uncomfortable breathing, or noticeable side seams pulling; may require sizing up or selecting a more forgiving stretch blend.
- Band too loose: Slippage during movement or hours of nursing; you may need to size down for a secure feel or choose a fabric with higher stretch to maintain support.
- Torso length misfit: If the tank drapes too low or rides up, consider a different length option or a bra-style alternative with shorter torso to ensure coverage during nursing.
- Cup/ bust fit: If the cups feel shallow or the fabric pulls across the bust when you lift your arms, you may need a size up or a different cup coverage as part of the design.
Between Sizes: What to do if you’re between sizes
- If you’re between sizes, prioritize the band fit first. A comfortably snug band that sits flat against the skin around underbust provides the most support for a longline design.
- If the bust feels tight in the smaller size, or you’re between cup sizes, go up a size to prevent gaping or underbust pressure. A minor trade-off in length can be acceptable if you gain overall comfort.
- Consider fabric composition: A blend with elastane or spandex will offer more stretch and tolerance between sizes. If you expect seasonal changes (e.g., swelling during certain times of the month), a fabric with stretch can help maintain fit.
How to measure yourself accurately (quick guide)
- Underbust: Measure directly under your bust, keeping the tape measure level and snug but not tight. For 90 cm, you’re around a 34 band in many systems.
- Bust: Measure across the fullest part of your bust with the tape horizontal. This helps you determine cup size and whether a longline will provide enough coverage.
- Torso length: If possible, measure from the base of your neck to the top of the hip bone to estimate how long the tank will sit on your torso.
- Consider wearing a similar bra to gauge how the tank will sit over or under it during nursing.
Care and fabric behavior (how to expect stretch over time)
- Most longline tanks use a blend that includes cotton, modal, or rayon with a touch of elastane. You’ll typically see some stretch that recovers after washing, but repeated wear may slightly alter the fit as the fibers relax.
- Always follow the care label: wash in cold water, avoid high heat in the dryer, and reshape while damp to maintain band integrity.
Final sizing guidance for your 90 cm underbust (concise decision paths)
- If you want a secure, supportive feel and your bust measurement sits comfortably within standard ranges for your band size, start with the size that aligns with a 34 band and then adjust based on bust fit.
- If you’re allergic to tight bands or prefer easier nursing access, consider sizing up for a comfy or relaxed fit.
- If you’re between sizes and the band is the main issue, choose the size that gives you the best band fit and accept minor changes in torso length or bust coverage.
Notable trade-offs to consider
- Tight bands improve security during movement and nursing but can limit breathing and comfort if you have a long day ahead or post-workout swelling.
- Looser bands provide comfort and easier nursing access but may require sizing up or wearing a supportive bra to maintain coverage.
- Longer torso lengths prevent ride-up but may wrap around the hips on shorter torsos; verify torso length against your torso measurements for best results.
What to do next (quick actions)
- Have your bust and underbust measurements ready, plus your preferred fit (snug, comfy, relaxed).
- If you’re between sizes, decide whether you prioritize band security or torso ease.
- If you’re shopping for daily nursing and layering, lean toward comfy or relaxed fits with a fabric blend that offers good stretch.
Last note
- Remember that sizing can vary slightly by style and fabric, so use these guidelines as a starting point and adjust based on your personal comfort and movement needs. If you have specific bust measurements or want a tailored size recommendation for your exact measurements, share them and I’ll zero in on the best size for you.
Last updated: December 2025 • Based on real customer conversations
