Why cotton composition is worth checking
100% cotton breathes best and is the sensible default for Pakistani summers, but it creases and can shrink slightly on the first wash. Cotton blends with a small amount of elastane hold their shape better and suit fitted cuts, which is why stretch boxer briefs usually include it. Polyester-heavy blends are cheaper and dry faster, but trap heat — generally the wrong choice for daily summer wear here.
Buying basics in multi-packs
Vests, boxers and briefs are usually sold in packs of three because they wear out together and get replaced together. Packs are cheaper per item than singles, but check the stated size range before ordering: "All Sizes" or "S-XL" on a listing means the pack is available across those sizes, not that the pack contains a mix of them. If you are between sizes in fitted styles, the larger one is usually the safer call.