A good shirt is the foundation of any stylish outfit — but what you wear underneath it is just as important. Whether you're heading to the office, a formal event, or keeping it casual, the right base layer makes all the difference in how you look and feel. In this guide, we’ll explain exactly what to wear under a shirt, and when.

👕 1. Why wear something under a shirt?

Going bare under a shirt might seem easy, but a base layer offers real advantages:

• Sweat protection: reduces stains and moisture marks

• Hygiene: keeps your shirt fresher for longer

• Comfort: especially with textured or itchy fabrics

• Durability: your shirts last longer with fewer washes

👉 Read also: How to handle sweat stains on dress shirts?

👕 2. The best undershirt options

✅ A thin, seamless T-shirt

Choose a close-fitting cotton T-shirt with stretch. Avoid visible seams or logos.

• Color: nude or beige blends better under white shirts than white itself

• Neckline: go for a V-neck if your shirt will be unbuttoned at the top

👉 See also: Which shirt fit works best for you?

☀️ A tank top (sleeveless undershirt)

Perfect for summer — just note it offers less underarm coverage.

❌ When not to wear an undershirt

• With very sheer shirts: the layer may show through

• On very hot days: with breathable fabrics like linen, you may want to skip it

👉 Read also: How to wear shirts in summer without overheating?

🚫 Undershirt mistakes to avoid

• White on white? Avoid it. It shows through more than skin-tone fabric.

• Loose fit? You'll see wrinkles and lines through your shirt.

• Logos or prints? Keep it clean and simple.

🧣 Bonus tip: Thermal undershirts for winter

In colder months, go for a fitted thermal undershirt — warm, breathable, and invisible under your shirt.