You most certainly can wear a jumper in warmer months, if you opt to buy this women's short sleeve ribbed knit sweater by KISSMODA.
Made with 100% viscose, it it very light, breathable, soft, incredibly comfortable, and cool. Being a UK 10-12, without this choice, I requested the 8-10, which fits well, the next size up could possibly be too loose. The flattering V-neck is just the right depth for me, the loose short bat wings, not too wide, cover my shoulders perfectly. Colours in the product description appear true, my choice was Whiteblack, and the shade block design blends really well. The eyelet knit pattern, on the top section, is very delicate, making the style one up from full rib knit.
Can be paired with a variety of garments, jeans, skirts, shorts etc., so is versatile to wear on many different occasions. Not too long in length, just resting on top of the hips (I'm 5' 4") hangs nicely over the body, isn't restricting. I prefer my one, half tucked into my jeans, but it looks equally good left loose.
For the price (just under twenty three pounds, although appears to be reduced now) I believe it to be relatively good value for money, and recommend this delightful top, which was offered on a promotional basis, not sold to me.