Hot air balloon 1st birthday outfit. [18-24 months only; ready to post.] Hot air balloon shorts and number 1 vest (long-sleeved). 18-24 months only. £4.50 Out of stock. Long-sleeved green vest with hot air balloon number one applique design. Matching hot air balloon shorts. 100% cotton. Both size 18-24 months only. Ready to post! RRP £17.50. Now just £12.