When I was a nipper, weekends and summer holiday were taken up tomato picking in big green houses. The nurseryman would not let us pick with bare arms. If he was not about we rolled our sleeves up as it was quite hot in there. Instant rash, treated with calamine when we got home and long sleeves again for a couple of days. We never learned. As the summer rolled on and we got tanned it was not so bad.