Is one allowed to cut hair other than head and facial hair during sefira (e.g. nose, ear, arms etc.)?
Essentially the minhag not to cut hair applies to all hair of the body and not only to facial hair. However it is permitted for a woman to tweeze unsightly hair such as from her eyebrows nose ears, as this is not considered taking a haircut. (In general for a man, it is not permitted even not during sefira because of lo tilbash). A married woman may shave her legs if not shaving them will bother her husband.
O:CH 551-12, Aruch Hashulchan ibid 31, Kovetz Halachos (Sefira) 10-1,2, Hilchos Chag Bchag (Sefiras Haomer) 7-14 ftnt. 55, M:B 79, Y:D 182-1.